1,254,658 people (2024 Census estimate, +16.6% since 2020)
841 square miles of land · 1,491 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.
35 active community water systems list Collin County in the area they serve, reporting 1,269,941 people served in all (a system that crosses county lines counts its whole population).
| CITY OF PLANO buys surface water · local government · TX0430007 | 292,059 served |
| CITY OF FRISCO buys surface water · local government · TX0430005 | 231,910 served |
| CITY OF MCKINNEY buys surface water · local government · TX0430039 | 224,043 served |
| CITY OF ALLEN buys surface water · local government · TX0430025 | 113,746 served |
| CITY OF CELINA buys surface water · local government · TX0430003 | 52,701 served |
| CITY OF WYLIE buys surface water · local government · TX0430011 | 48,393 served |
| TOWN OF PROSPER buys surface water · local government · TX0430009 | 42,598 served |
| CITY OF PRINCETON buys surface water · local government · TX0430008 | 37,019 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 1,166 people were held in Collin County's jail, in Vera's latest figure (2026). In 2021 it was about 936.
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.
14 school districts have their office in Collin County. School taxes are usually the largest part of a property tax bill.
Spent $967 million — $683.7 million to run schools, about $10,217 per student, plus $185.9 million on buildings and equipment. Money in: $698 million local (mostly property tax), $117.9 million state, $52.7 million federal. Long-term debt: $2.3 billion.
Spent $869.6 million — $556.9 million to run schools, about $11,384 per student, plus $34.9 million on buildings and equipment. Money in: $639.6 million local (mostly property tax), $58.5 million state, $59.9 million federal. Long-term debt: $492.2 million.
Spent $681.3 million — $266.4 million to run schools, about $10,664 per student, plus $354.6 million on buildings and equipment. Money in: $283.3 million local (mostly property tax), $98.7 million state, $15.9 million federal. Long-term debt: $1.4 billion.
Spent $373.1 million — $260 million to run schools, about $11,139 per student, plus $67.1 million on buildings and equipment. Money in: $299.5 million local (mostly property tax), $31.6 million state, $29 million federal. Long-term debt: $533.9 million.
Spent $338.2 million — $226.8 million to run schools, about $10,417 per student, plus $69.8 million on buildings and equipment. Money in: $266.3 million local (mostly property tax), $29.3 million state, $14.7 million federal. Long-term debt: $677.4 million.
Spent $242.1 million — $209.9 million to run schools, about $11,136 per student, plus $10 million on buildings and equipment. Money in: $143.8 million local (mostly property tax), $92.5 million state, $17.8 million federal. Long-term debt: $420 million.
Spent $161.6 million — $83.1 million to run schools, about $10,598 per student, plus $62.6 million on buildings and equipment. Money in: $56.6 million local (mostly property tax), $53.2 million state, $10.4 million federal. Long-term debt: $348.4 million.
Spent $164.7 million — $59.3 million to run schools, about $10,487 per student, plus $91.6 million on buildings and equipment. Money in: $50.3 million local (mostly property tax), $27.9 million state, $3.4 million federal. Long-term debt: $318.9 million.
And 6 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 High compared with other U.S. counties. FEMA estimates natural hazards cost Collin County about $716.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
1,139 bridges in Collin County: 770 in good condition, 368 fair, and 1 poor (0.1%). “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.
| STACY RD EB over COTTONWOOD CREEK · built 2001 | 16,994 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $179.5 million of work in Collin County in fiscal 2025, about $169 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 Collin 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 Collin County built: brayden.ozark@gmail.com.
More of Texas: the state government and every county in Texas.
Nearby counties: Rockwall County (23 mi) · Hunt County (29 mi) · Grayson County (30 mi) · Denton County (31 mi) · Dallas County (32 mi) · Fannin County (39 mi).