727,480 people (2024 Census estimate, +18.2% since 2020)
1,116 square miles of land · 652 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
40 active community water systems list Williamson County in the area they serve, reporting 701,493 people served in all (a system that crosses county lines counts its whole population).
| CITY OF GEORGETOWN surface water · local government · TX2460001 | 191,639 served |
| CITY OF ROUND ROCK surface water · local government · TX2460003 | 130,662 served |
| CITY OF LEANDER surface water · local government · TX2460012 | 98,330 served |
| CITY OF CEDAR PARK surface water · local government · TX2460009 | 86,939 served |
| JONAH WATER SUD buys surface water · local government · TX2460022 | 29,861 served |
| CITY OF HUTTO buys surface water · local government · TX2460007 | 29,580 served |
| CITY OF TAYLOR buys surface water · local government · TX2460004 | 20,622 served |
| BRUSHY CREEK MUD surface water · local government · TX2460061 | 18,314 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 641 people were held in Williamson County's jail, in Vera's latest figure (2026). In 2021 it was about 551.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
11 school districts have their office in Williamson County. School taxes are usually the largest part of a property tax bill.
Spent $747.3 million — $509.5 million to run schools, about $10,955 per student, plus $80 million on buildings and equipment. Money in: $496.6 million local (mostly property tax), $53.3 million state, $51.3 million federal. Long-term debt: $794.7 million.
Spent $613.9 million — $452.5 million to run schools, about $10,669 per student, plus $32 million on buildings and equipment. Money in: $512.8 million local (mostly property tax), $56.9 million state, $37.6 million federal. Long-term debt: $1 billion.
Spent $349.2 million — $147.8 million to run schools, about $11,236 per student, plus $128.1 million on buildings and equipment. Money in: $193.7 million local (mostly property tax), $16.7 million state, $16.7 million federal. Long-term debt: $551.7 million.
Spent $173.2 million — $110.8 million to run schools, about $11,516 per student, plus $36.7 million on buildings and equipment. Money in: $111.1 million local (mostly property tax), $26.1 million state, $13.5 million federal. Long-term debt: $445 million.
Spent $279.8 million — $81.1 million to run schools, about $10,310 per student, plus $172.3 million on buildings and equipment. Money in: $111.3 million local (mostly property tax), $13 million state, $7.3 million federal. Long-term debt: $482.5 million.
Spent $100.3 million — $38.2 million to run schools, about $11,363 per student, plus $55.6 million on buildings and equipment. Money in: $44 million local (mostly property tax), $7.9 million state, $4.7 million federal. Long-term debt: $195.1 million.
Spent $44.5 million — $38.2 million to run schools, about $12,158 per student, plus $3.3 million on buildings and equipment. Money in: $31.7 million local (mostly property tax), $12.1 million state, $6.6 million federal. Long-term debt: $55.7 million.
Spent $22.1 million — $14.9 million to run schools, about $12,731 per student, plus $4.6 million on buildings and equipment. Money in: $13.8 million local (mostly property tax), $5.6 million state, $2.1 million federal. Long-term debt: $56.3 million.
And 3 more.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Williamson County about $136.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
1,171 bridges in Williamson County: 804 in good condition, 363 fair, and 4 poor (0.3%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| FM 619 over DRAW · built 1935 | 1,224 vehicles a day |
| CR 118 over COTTONWOOD CREEK · built 1926 | 506 vehicles a day |
| CR 126 over MILEHAM BR · built 1922 | 100 vehicles a day |
| CR 434 over BRUSHY CREEK · built 1930 | 60 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $729.6 million of work in Williamson County in fiscal 2025, about $1,198 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
General election: Tuesday, November 3, 2026. Last day to register to vote: 2026-10-05. Early voting: 2026-10-19 to 2026-10-30. Mail ballot application must be received: 2026-10-23. Election Day: 2026-11-03.
Source: Texas Secretary of State, Sept. 28, 2026 · VoteTexas.gov — early voting · VoteTexas.gov
The budget, property tax rates, audits, local officials and offices for Williamson County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Williamson County built: brayden.ozark@gmail.com.
More of Texas: the state government and every county in Texas.
Nearby counties: Bell County (28 mi) · Travis County (29 mi) · Burnet County (37 mi) · Milam County (38 mi) · Bastrop County (42 mi) · Lee County (44 mi).