Williamson County is located in Middle Tennessee, directly south of Nashville and bordering the Tennessee River watershed to the west. Created in 1799 and named for Hugh Williamson, the county developed as part of the region’s early agrarian economy and later became closely tied to the growth of the Nashville metropolitan area. It is a large county by Tennessee standards, with a population of roughly 250,000 residents, and it is among the state’s fastest-growing counties in recent decades. The county combines suburban and urbanized communities—particularly in and around Franklin, Brentwood, and Spring Hill—with remaining rural areas characterized by rolling hills, limestone-based soils, and open farmland typical of the Central Basin and Highland Rim transition zone. Its economy is diversified, including corporate offices, professional services, healthcare, and advanced manufacturing, alongside local commerce and tourism tied to historic sites. The county seat is Franklin.

Williamson County Local Demographic Profile

Williamson County is located in Middle Tennessee, immediately south of Nashville in the state’s central region. The county includes rapidly growing suburban communities such as Franklin, Brentwood, and Spring Hill.

Population Size

According to the U.S. Census Bureau QuickFacts for Williamson County, Tennessee, Williamson County had an estimated population of ~260,000 (2023).

Age & Gender

According to the U.S. Census Bureau QuickFacts for Williamson County, Tennessee (commonly reported from the most recent ACS profile shown on QuickFacts), the county’s age structure is summarized as:

  • Under 18: ~25–26%
  • 18 to 64: ~59–60%
  • 65 and over: ~14–15%

The same QuickFacts profile reports the gender composition as approximately:

  • Female: ~50%
  • Male: ~50%

Racial & Ethnic Composition

Per the U.S. Census Bureau QuickFacts for Williamson County, Tennessee, the county’s racial and ethnic composition (categories as presented by the Census Bureau) is approximately:

  • White (alone): ~84–86%
  • Black or African American (alone): ~3–4%
  • Asian (alone): ~5–6%
  • Two or more races: ~4–5%
  • Hispanic or Latino (of any race): ~6–7%

Household & Housing Data

From the U.S. Census Bureau QuickFacts for Williamson County, Tennessee, key household and housing indicators include:

  • Households: ~95,000–100,000
  • Average household size: ~2.6–2.7 persons
  • Owner-occupied housing rate: ~75–80%
  • Median value of owner-occupied housing units: typically reported on QuickFacts (ACS-based), reflecting one of the higher median home values in Tennessee
  • Median household income: typically reported on QuickFacts (ACS-based), reflecting one of the higher median household incomes in Tennessee

For local government and planning resources, visit the Williamson County official website.

Email Usage

Williamson County, part of the Nashville metro area, combines fast-growing suburban communities with more rural fringes; higher population density around Franklin and major corridors generally supports stronger broadband availability than outlying areas, shaping how residents access email and other digital services.

Direct county-level email-usage rates are not typically published, so broadband and device access serve as proxies for likely email access. The most recent U.S. Census Bureau (data.census.gov) American Community Survey tables on internet subscriptions and computer ownership provide the standard indicators for household capacity to use email. County-level broadband deployment constraints are reflected in provider-reported availability and technology mix in the FCC National Broadband Map, which can highlight remaining service gaps at the census-location level.

Age distribution influences email adoption because older adults are more likely to rely on email for healthcare, government, and financial communication, while younger groups often substitute messaging apps; county age structure is available through ACS demographic profiles. Gender is generally not a primary driver of email access compared with age, income, and broadband/device availability; sex composition is also available in ACS profiles.

Mobile Phone Usage

Williamson County is located in Middle Tennessee, immediately south of Nashville in the state’s rapidly growing metropolitan corridor. The county includes suburban and exurban communities (notably Franklin, Brentwood, Nolensville, and Spring Hill) as well as lower-density rural areas in the south and east. Topography is characteristic of the Central Basin and Highland Rim transition, with rolling hills and creek valleys that can affect radio propagation and create localized coverage variability. Population density is highest along major corridors (I‑65 and state highways connecting to Nashville and Rutherford County), where mobile network investment and performance tend to be strongest.

Data scope and limitations (county-level vs broader geographies)

County-specific measures of “mobile penetration” are not consistently published as a single metric. The most comparable indicators at county scale typically come from:

  • Household survey estimates (internet subscription types, smartphone/computer availability) from the U.S. Census Bureau.
  • Network coverage/availability datasets from the FCC, which describe where service is reported as available, not whether residents subscribe.
  • State mapping and planning resources that compile provider-reported coverage and, in some cases, local validation.

Household adoption and network availability are separated below; they are not interchangeable.

Mobile penetration or access indicators (adoption)

Household adoption indicators (internet subscription and device access)

  • The most widely used county-level adoption measures are from the U.S. Census Bureau’s American Community Survey (ACS), which reports:
    • Household internet subscription status and type (including cellular data plans).
    • Household device availability (smartphone, computer, tablet, etc., depending on ACS tables).
  • These ACS measures represent household adoption/availability and do not measure signal quality or outdoor coverage.

Primary source for county-level tables:

  • Census.gov (data.census.gov) — search “Williamson County, Tennessee” and internet subscription/device tables (ACS 1-year or 5-year, depending on availability).

Interpretation notes

  • “Cellular data plan” in ACS generally indicates households reporting internet service via a mobile data plan, which can overlap with fixed broadband households (households may report multiple subscription types).
  • Smartphone availability in ACS is a proxy for access to mobile internet-capable devices, but it does not indicate active service, data plan size, or network performance.

Network availability (4G/5G) versus household adoption

Network availability (coverage)

FCC mobile broadband coverage

  • The FCC’s Broadband Data Collection (BDC) includes provider-reported mobile broadband coverage by technology generation and advertised performance. This is an availability dataset and does not indicate take-up.
  • Coverage is reported as polygons and can be summarized by location or area, but reported availability may differ from observed performance, especially near coverage edges or in varied terrain.

Key FCC sources:

Tennessee broadband mapping and planning

  • State resources commonly compile or contextualize broadband availability, including mobile where reported, but these are still primarily availability-focused.
  • Tennessee Office of Digital Connectivity — statewide broadband planning and mapping references.

Household adoption (subscription)

Census subscription estimates

  • Adoption of cellular data plans and overall internet subscription is tracked via ACS and reflects household behavior rather than network presence.
  • Census.gov — ACS internet subscription tables for Williamson County.

Mobile internet usage patterns (4G/5G availability and typical drivers)

4G LTE and 5G availability (availability-focused)

  • In suburban and urbanizing areas of Williamson County (north/central, closer to Nashville and along I‑65), provider investment tends to support broader 4G LTE and 5G availability than in more rural tracts. This statement reflects general network deployment patterns seen nationally; precise county subarea comparisons require map-based verification from the FCC.
  • Reported 5G availability varies by carrier and by 5G type (low-band wide-area coverage versus mid-band capacity-focused deployments). The FCC map is the standardized public source for carrier-reported availability.

Authoritative map reference:

Actual usage patterns (adoption-focused)

County-level public data typically does not publish detailed behavioral metrics such as:

  • Share of mobile users primarily on 4G vs 5G
  • Data consumption per subscriber
  • Application usage categories
    Such metrics are usually held by carriers or commercial analytics vendors and are not consistently available for a single county in an official public dataset. The most defensible public proxy at county scale remains ACS subscription types (including cellular data plans).

Common device types (smartphones vs other devices)

Smartphone prevalence (proxy via Census device questions)

  • The ACS includes household device categories that can be used to describe the share of households with smartphones and other computing devices. This supports a county-level description of device access (smartphone-only vs smartphone-plus-computer households).
  • These are household device availability indicators, not direct counts of active mobile lines.

Source for device-type tables:

  • Census.gov — ACS “Computer and Internet Use” tables for Williamson County.

Other device connectivity

  • Tablets, laptops, and fixed wireless receivers may use Wi‑Fi primarily but can also connect via mobile hotspots or embedded cellular (less commonly measured in public county statistics).
  • Wearables and IoT devices are not well captured in public county-level datasets; official statistics generally focus on household devices and subscription types.

Demographic and geographic factors influencing mobile usage and connectivity

Geography, land use, and transportation corridors (availability-focused)

  • Suburban density and corridor development: Higher densities and major corridors (I‑65; employment and retail centers in/near Franklin and Brentwood; growth areas near Spring Hill) support more cell sites and higher-capacity deployments.
  • Terrain and vegetation: Rolling terrain and tree cover can increase localized signal variability, particularly in less dense southern/eastern areas, affecting indoor coverage and edge-of-cell performance. This is a propagation consideration; confirmation of specific gaps requires map and field validation.

County context:

Population characteristics and adoption (adoption-focused)

  • Income and education: Williamson County is commonly characterized by higher-than-average household incomes and educational attainment compared with many U.S. counties, factors that are associated in national surveys with higher rates of internet subscription and multi-device households. County-specific values should be taken directly from Census products rather than inferred from reputation.
  • Age composition: Age influences adoption and reliance on smartphones versus computers; county-specific age structure and its relationship to device use is best assessed using ACS demographics alongside ACS computer/internet tables rather than assuming a pattern.

Demographic baselines:

  • Census.gov — ACS demographic profiles and “Computer and Internet Use” tables.

Summary: availability versus adoption in Williamson County

  • Network availability: Best documented through provider-reported FCC BDC mobile coverage (4G/5G) and related mapping products. These indicate where service is reported as available, not whether residents subscribe or experience consistent indoor performance.
  • Household adoption: Best documented through ACS household internet subscription types (including cellular data plans) and household device availability (smartphones and other devices). These show reported household access and subscription patterns, not coverage quality.

Primary references for verification and county-level extraction:

Social Media Trends

Williamson County is part of the Nashville metropolitan area in Middle Tennessee and includes Franklin, Brentwood, and parts of Spring Hill. The county is among Tennessee’s highest-income and fastest-growing areas, with a large share of college-educated residents and many professional/managerial workers commuting within the region—factors commonly associated with higher smartphone ownership, broadband access, and frequent use of major social platforms.

User statistics (penetration and active use)

  • County-level social media penetration is not routinely published by major survey programs; the most defensible local estimate is to apply statewide/national usage benchmarks to the county’s demographic profile.
  • National baseline: About 69% of U.S. adults report using at least one social media site, according to the Pew Research Center social media fact sheet.
  • Context for Williamson County: Pew’s reporting consistently shows higher social media adoption among adults with higher income and education, characteristics that are more prevalent in Williamson County than in Tennessee overall; this supports a county expectation at or above the national adult baseline, though a precise county percentage is not available from Pew or similar national surveys.

Age group trends (who uses social media most)

Based on Pew’s age-by-age measures (Pew Research Center: Social media use by age):

  • 18–29: Highest usage (roughly mid‑80%+ of adults).
  • 30–49: High usage (roughly upper‑70%).
  • 50–64: Majority usage (roughly around 60%).
  • 65+: Lowest usage (roughly around 40%). Local implication: Williamson County’s combination of family households and high labor-force participation in professional roles typically aligns with heavy use among 30–49 and 18–29, with meaningful adoption among 50–64.

Gender breakdown

  • Across U.S. adults, overall social media use tends to be broadly similar by gender, while platform choice varies. Pew reports platform-level differences such as women over-indexing on Pinterest and Instagram, and men often over-indexing on YouTube/Reddit in some measures (Pew platform demographics).
  • County-specific gender splits are not published in standard public datasets; patterns above are the most reliable reference for Williamson County in the absence of a local survey.

Most-used platforms (percent using each platform)

Pew’s platform reach among U.S. adults provides the most widely cited benchmark (Pew Research Center: Platform use):

  • YouTube: ~83%
  • Facebook: ~68%
  • Instagram: ~47%
  • Pinterest: ~35%
  • TikTok: ~33%
  • LinkedIn: ~30%
  • WhatsApp: ~29%
  • Snapchat: ~27%
  • X (Twitter): ~22%
  • Reddit: ~22%

Local interpretation: Given Williamson County’s professional workforce and higher educational attainment, LinkedIn usage is commonly higher than national averages in similar demographics, while Facebook and YouTube remain broad-reach platforms across age groups.

Behavioral trends (engagement patterns and preferences)

  • Video-first consumption dominates: YouTube’s broad reach indicates that how-to, local news clips, sports highlights, and entertainment video are central engagement formats; short-form video platforms (notably TikTok and Instagram Reels) capture disproportionate attention among younger adults (Pew platform usage: YouTube/TikTok/Instagram reach).
  • Age-based platform sorting:
    • Older adults skew toward Facebook for community updates, groups, local events, and neighborhood information.
    • Younger adults skew toward Instagram, TikTok, Snapchat for messaging, creator content, and trend-driven discovery (Pew age/platform breakdown: Pew demographics tables).
  • Professional/networking utility: Higher concentrations of managerial and professional roles correlate with heavier LinkedIn use for hiring, networking, and industry content, consistent with Pew’s education/income gradients in platform adoption (Pew: platform use by education/income).
  • Multi-platform routines: Typical behavior is multi-platform use (e.g., YouTube for video, Facebook for groups/events, Instagram/TikTok for short-form discovery), with attention split by format rather than a single “primary” network—an overall pattern reflected in Pew’s cross-platform adoption rates (Pew: overall social media use).

Family & Associates Records

Williamson County, Tennessee maintains family and associate-related public records through a combination of state and county offices. Vital records (birth and death certificates) are issued and controlled by the Tennessee Department of Health, Office of Vital Records, with local services typically available through the county health department for eligible requests. Adoption records are generally handled through state courts and vital records systems and are not treated as open public records. Marriage-related records are maintained locally by the county clerk, including marriage licenses and related filings; see the Williamson County Clerk.

Public databases commonly available include recorded property and lien documents that can reflect family and associate connections (deeds, mortgages, releases) via the Williamson County Register of Deeds. Court records that may reference family relationships (probate, guardianship, domestic relations case dockets) are maintained by the Williamson County Circuit Court Clerk and the Tennessee Chancery Courts system (Williamson County Chancery).

Access occurs online where offices provide search portals, and in person at the relevant office for certified copies, indexing assistance, and older records. Privacy restrictions apply broadly to vital records, adoption files, and certain court matters (including sealed, juvenile, and protected information), with access governed by Tennessee statutes and court rules.

Marriage & Divorce Records

Types of records available

Marriage records (licenses and certificates)

  • Marriage license: Issued at the county level before a marriage occurs and returned after the ceremony for recording.
  • Recorded marriage record/certificate: The recorded license (often functioning as the county’s marriage record) maintained by the county after the completed license is returned and filed.

Divorce records (decrees and case files)

  • Divorce decree (Final Judgment/Final Decree): The court’s final order dissolving a marriage and setting terms such as property division, parenting plan, child support, and alimony when applicable.
  • Divorce case file: Pleadings and orders filed in the divorce action (complaint, summons/returns, motions, parenting plan filings, orders, and final decree).

Annulment records

  • Annulment orders: Court orders declaring a marriage void or voidable under Tennessee law. Annulment matters are maintained as court case files with final orders.

Where records are filed and how they can be accessed

Marriage records (Williamson County)

  • Filed/recorded with: Williamson County Clerk (marriage license issuance and recording).
  • Access:
    • In-person request through the County Clerk’s office.
    • Some indexes and copies may be obtainable through county record-search systems or archival holdings when applicable; availability varies by record age and local digitization.
  • State-level copies:
    • Tennessee maintains statewide marriage record services through the Tennessee Office of Vital Records for eligible years/requests.
      Link: Tennessee Office of Vital Records

Divorce and annulment records (Williamson County)

  • Filed with: Williamson County Chancery Court and/or Williamson County Circuit Court (Tennessee divorce jurisdiction commonly lies in these courts; the specific court depends on how the case was filed).
  • Access:
    • Case information and copies are obtained from the clerk of the court where the case was filed (Circuit Court Clerk or Chancery Court Clerk & Master, as applicable).
    • Older case files may be transferred to county archives or off-site storage; access remains through the custodial office’s procedures.
  • State-level verification:
    • Tennessee issues vital records divorce certificates for qualifying years through the Tennessee Office of Vital Records. These are typically summaries for administrative use and are distinct from full court decrees.
      Link: Tennessee Office of Vital Records

Typical information included in these records

Marriage licenses/recorded marriage records

Commonly include:

  • Full names of both parties (and, depending on the era/form, prior names)
  • Date of marriage and/or date license was issued/recorded
  • Place of marriage (county/state; sometimes specific location)
  • Ages or dates of birth (varies by period and form)
  • Addresses/residences at time of application (often listed)
  • Names of officiant and officiant’s title; signature(s) of parties and officiant
  • License number, recording information, and clerk’s certification

Divorce decrees and case files

Commonly include:

  • Names of parties; case number; court and county
  • Filing date and date of final decree
  • Grounds and findings (as reflected in pleadings and final order)
  • Orders on division of property/debts
  • Parenting plan designations, visitation, child support, and health insurance provisions when applicable
  • Spousal support (alimony) provisions when applicable
  • Restoration of former name (when granted)
  • Signatures of the judge and attestations by the court clerk

Annulment orders and case files

Commonly include:

  • Names of parties; case number; court and county
  • Legal basis and findings supporting annulment
  • Orders addressing name restoration and, when applicable, matters such as property allocation and parenting-related provisions

Privacy and legal restrictions

Marriage records

  • Marriage records are generally treated as public records at the county level, subject to Tennessee public records law and administrative redaction practices.
  • Certain personal identifiers may be limited or redacted in copies provided to the public under privacy protections (for example, sensitive identifying information included on modern forms).

Divorce and annulment court records

  • Divorce and annulment case files are generally public court records unless a statute, court rule, or court order restricts access.
  • Courts may restrict access to specific documents or information, including:
    • Records sealed by court order
    • Confidential or protected information (such as Social Security numbers, financial account numbers, and certain information involving minors)
    • Protected health information or confidential evaluations where applicable
  • Certified copies are issued by the clerk of the court maintaining the file; access and copying are subject to court and clerk administrative rules and applicable fees.

Education, Employment and Housing

Williamson County is located in Middle Tennessee directly south of Nashville and includes Franklin (county seat), Brentwood, Spring Hill, Fairview, and smaller unincorporated communities. It is one of the fastest‑growing, higher‑income counties in the state, with a large share of family households and a commuter-oriented connection to the Nashville metropolitan labor market. Population, income, commuting, education attainment, and housing values are commonly benchmarked using the county’s profile in the U.S. Census Bureau QuickFacts (Williamson County, TN) and 5‑year American Community Survey (ACS) estimates.

Education Indicators

Public schools (counts and names)

  • Public school system: The county is primarily served by Williamson County Schools (WCS), with additional public schools in parts of some municipalities depending on boundary and enrollment patterns.
  • Number of public schools and names: WCS operates dozens of campuses across elementary, middle, and high school levels; the most current school roster and campus names are maintained by the district in the Williamson County Schools directory.
    Note: A single, fixed “number of public schools” changes with openings/redistricting; the district directory is the most up-to-date authoritative list.

Student–teacher ratios and graduation rates

  • Student–teacher ratio: The most commonly cited countywide classroom ratio is reported through federal/NCES district profiles; a consolidated countywide figure is not consistently posted as a single number on county profiles. A reliable proxy is the district’s federal profile and Tennessee report card sources referenced below.
  • Graduation rate: The county’s public high school graduation outcomes are reported annually by the state in the district report card system; WCS is typically above the Tennessee statewide average. The current official rates and trend lines are available through the Tennessee Department of Education District Report Card.
    Proxy note: The state report card is the definitive source for the latest cohort graduation rate; secondary summaries may lag.

Adult educational attainment (county residents)

  • High school diploma or higher; bachelor’s degree or higher: Williamson County has among the highest educational attainment levels in Tennessee. The most recent ACS-based percentages for high school graduate or higher and bachelor’s degree or higher are published in QuickFacts for Williamson County (updated as new ACS 5‑year releases are incorporated).
    Data note: QuickFacts provides the standard, comparable attainment measures used for county profiles.

Notable academic programs (STEM, CTE, AP)

  • Advanced coursework: High schools in the county commonly offer Advanced Placement (AP) and other advanced academic pathways; program availability varies by campus and is documented in school course catalogs and district program pages.
  • Career and Technical Education (CTE)/vocational training: Tennessee districts report CTE offerings and participation through state reporting; WCS program information is available through district publications and the state report card framework.
  • STEM and specialized pathways: STEM offerings are typically embedded through math/science course sequences, project-based learning, and career pathways; the most current program descriptions are maintained by the district in program and school pages within Williamson County Schools.
    Availability note: Campus-by-campus program lists are the most accurate source; countywide “STEM program count” is not typically published as a single metric.

School safety measures and counseling resources

  • Safety: Districts in Tennessee commonly use layered safety practices (controlled building access, visitor management, drills, and coordination with local law enforcement). Current district safety policies and communications are maintained by WCS in its official channels (WCS).
  • Counseling/mental health resources: Public schools provide student support services such as school counseling; staffing models and services are generally described through district student services pages and school-level counseling pages.

Employment and Economic Conditions

Unemployment rate (most recent year available)

  • Unemployment rate: The most recent official unemployment rates for Williamson County are published by the U.S. Bureau of Labor Statistics (BLS) Local Area Unemployment Statistics. The current county series is accessible via BLS LAUS (county estimates updated monthly; annual averages also available).
    Data note: County unemployment varies seasonally; annual averages provide a stable comparison.

Major industries and employment sectors

  • Sector mix: Employment is concentrated in professional and business services, healthcare, education, retail/food services, construction, and finance/insurance—consistent with a high-income suburban county in the Nashville metro area. Sector composition is commonly summarized via ACS “industry by occupation” tables and county economic profiles; QuickFacts and ACS remain the most comparable public sources (QuickFacts).

Common occupations and workforce breakdown

  • Occupational profile: A large share of residents work in management, business/financial operations, professional/technical roles, healthcare, sales, and administrative support, reflecting the county’s educational attainment and corporate/healthcare presence in the region. Occupational distribution is available through ACS occupation tables (referenced through data.census.gov) and summarized in QuickFacts-linked ACS content.

Commuting patterns and mean commute time

  • Mean travel time to work: The county’s mean commute time is reported in ACS and displayed in QuickFacts. As a Nashville-region commuter county, commuting times tend to be influenced by peak-hour travel on key corridors (including I‑65 and arterial routes).
  • Mode share: Most commuters travel by car; ACS provides shares for driving alone, carpooling, public transit, walking, and working from home through data.census.gov.

Local employment versus out-of-county work

  • Work location: Williamson County functions as both an employment center (notably in Franklin/Cool Springs and parts of Brentwood/Spring Hill) and a major residential base for workers employed elsewhere in the Nashville metro. The best public proxy measures are ACS “county-to-county commuting” and “place of work” tables available through data.census.gov.
    Data note: County profiles typically summarize commuting time and mode more consistently than “in-county vs out-of-county” shares, which require specific ACS commuting tables.

Housing and Real Estate

Homeownership rate and rental share

  • Owner-occupied vs renter-occupied: The county’s homeownership rate and renter share are reported through ACS and published in QuickFacts. Williamson County is characterized by a comparatively high owner-occupancy rate for a large suburban county.

Median property values and recent trends

  • Median owner-occupied home value: The ACS median value for owner-occupied housing is reported in QuickFacts.
  • Recent trends: Market values in Williamson County rose substantially during the 2020–2022 period, followed by slower growth/greater variability with higher interest rates; ACS median value updates reflect multi-year survey periods and therefore lag real-time market shifts.
    Proxy note: For near-real-time market trend tracking, local MLS and private-market indices are commonly used, but ACS/QuickFacts remains the standardized public benchmark.

Typical rent prices

  • Median gross rent: Median gross rent is published in QuickFacts (ACS). Rents tend to be higher in high-demand submarkets near major employment areas (e.g., Franklin/Cool Springs, Brentwood-adjacent areas, and Spring Hill growth corridors).

Types of housing

  • Housing stock: The county includes a large share of single-family detached homes, newer subdivisions, and townhome/apartment development in higher-growth nodes, alongside rural lots and estate-scale properties in less dense areas. ACS housing unit type tables (via data.census.gov) provide the official breakdown by structure type.

Neighborhood characteristics (proximity to schools/amenities)

  • Development pattern: Higher-density residential and mixed-use development is concentrated around municipal centers and commercial corridors (Franklin, Brentwood edges, Spring Hill), often proximate to schools, parks, and retail nodes. Lower-density neighborhoods and rural residential areas are more common toward the county’s periphery, with longer travel distances to major amenities.

Property tax overview (rate and typical homeowner cost)

  • Property tax administration: Property taxes are levied based on assessed value and set rates by jurisdiction (county plus any applicable municipal rates). The county trustee/assessor pages provide current tax rate structures and billing details; a central starting point is the county government’s official site: Williamson County, TN government.
  • Typical homeowner cost (proxy): A common standardized way to compare property tax burden is median real estate taxes paid (ACS), published in QuickFacts.
    Proxy note: “Average rate” varies by municipality and reassessment cycles; ACS median taxes paid provides a consistent countywide measure, while the county’s published tax rate schedules provide the legal rates for the current year.