Williamson County
Large fringe metro
FIPS 48491
Profiled Cities (3)
People
752.8K
Population
Census 2025 Est.674.7/sq mi
Density
Census 2025 Est.22.3%
Growth 2020–25
Census 2020–2025$111K
Median HH Income
ACS 2024 5-yr37.3
Median Age
ACS 2024 5-yr94.1%
Bachelor's+
ACS 2024 5-yr6.4%
Poverty Rate
SAIPE 20249.8%
Uninsured
ACS 2024 5-yr66.4%
Owner-Occupied
ACS 2024 5-yr10.6%
Disability
ACS 2024 5-yr24.7%
Hispanic
ACS 2024 5-yr53.3%
Non-Hisp. White
ACS 2024 5-yr6.7%
Non-Hisp. Black
ACS 2024 5-yrMigration
IRS Statistics of Income county migration. Measures tax filer movement, not Census population counts.
58.4K
Inflow (people)
IRS SOI 2022–2343.5K
Outflow (people)
IRS SOI 2022–2314.9K
Net Migration
IRS SOI 2022–23Economy
3.6%
Unemployment
BLS LAUS 2025412.3K
Labor Force
BLS LAUS 2025$76K
Per Capita Income
BEA 2024$44.6B
County GDP
BEA 202415K
Business Establishments
CBP 2023203.9K
Employees
CBP 2023$13.5B
Annual Payroll
CBP 2023Housing
$447K
Median Home Value
ACS 2024 5-yr$2K
Median Gross Rent
ACS 2024 5-yr32.8K
Owner HH w/ Housing Problems
ACS 2024 5-yr35.1K
Renter HH w/ Housing Problems
ACS 2024 5-yrYes
Housing Stress (USDA)
ACS 2024 5-yrHealth
32nd pctile
Social Vulnerability
CDC SVI 202232.1%
Adult Obesity
CDC PLACES 20259.5%
Diabetes
CDC PLACES 202515.6%
Poor Mental Health
CDC PLACES 20259.6%
Current Smoking
CDC PLACES 202563.9/100K
Primary Care Physicians
HRSA AHRF 2024–251.4/1K
Hospital Beds
HRSA AHRF 2024–25527.0/1K bene
Medicare ER Visits
CMS 2023Environment & Risk
90.1
FEMA Risk Score
FEMA NRI Dec 2025Relatively Moderate
Risk Rating
FEMA NRI Dec 2025Very High
Resilience Rating
FEMA NRI Dec 2025$136.6M
Expected Annual Loss
FEMA NRI Dec 20259.04
PM2.5 (EPA EJScreen)
EPA EJScreen 20240.13
Diesel PM
EPA EJScreen 20241.1%
EJ Demographic Index
EPA EJScreen 2024Broadband & Food Access
1.0%
Fixed Broadband 100/20 Mbps
FCC 20241.0%
Mobile 5G Coverage
FCC 202447.8%
Low Food Access (pop)
USDA FEA 20191.2%
No-Car Low Food Access (HH)
USDA FEA 2019Land & Climate
1115.8 sq mi
Land Area
TIGER 202467.6°F
Avg Temp (1991–2020)
NOAA 1991–202079.1°F
Avg Max Temp
NOAA 1991–202056.0°F
Avg Min Temp
NOAA 1991–202035.9"
Annual Precip
NOAA 1991–2020County Character
Metro - Counties in metro areas of 1 million population or more
Rural-Urban Class (RUCC)
TIGER 2024Large fringe metro
NCHS Urban-Rural Class
TIGER 2024Not industry-dependent
Industry Dependence (USDA)
TIGER 2024None
Typology Flags
TIGER 2024Yes
Retirement Destination
TIGER 2024