837,359 people (2024 Census estimate, +0.8% since 2020)
405 square miles of land · 2,065 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.
12 active community water systems list Hamilton County in the area they serve, reporting 879,037 people served in all (a system that crosses county lines counts its whole population).
| CINCINNATI PUBLIC WATER SYSTEM surface water · local government · OH3102612 | 800,000 served |
| NORWOOD CITY PWS buys surface water · local government · OH3101703 | 19,870 served |
| INDIAN HILL CITY PWS groundwater · local government · OH3101112 | 15,000 served |
| HARRISON CITY PWS groundwater · local government · OH3100812 | 11,600 served |
| WYOMING CITY PWS groundwater · local government · OH3102212 | 9,700 served |
| READING CITY PWS buys surface water · local government · OH3101812 | 9,506 served |
| CLEVES VILLAGE PWS groundwater · local government · OH3100512 | 6,000 served |
| LOCKLAND VILLAGE PWS groundwater · local government · OH3101212 | 3,486 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 1,138 people were held in Hamilton County's jail, in Vera's latest figure (2024), or 215 per 100,000 residents ages 15–64. In 2019 it was about 1,796.
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.
23 school districts have their office in Hamilton County. School taxes are usually the largest part of a property tax bill.
Spent $777.6 million — $690.8 million to run schools, about $19,413 per student, plus $20.9 million on buildings and equipment. Money in: $412 million local (mostly property tax), $189.7 million state, $174.5 million federal. Long-term debt: $456.8 million.
Spent $129.6 million — $114.1 million to run schools, about $13,288 per student, plus $4.9 million on buildings and equipment. Money in: $74.1 million local (mostly property tax), $36.7 million state, $23 million federal. Long-term debt: $86.1 million.
Spent $102.7 million — $94 million to run schools, about $12,418 per student, plus $4.7 million on buildings and equipment. Money in: $43 million local (mostly property tax), $34.5 million state, $11 million federal. Long-term debt: $10.9 million.
Spent $103.7 million — $96.3 million to run schools, about $13,524 per student, plus $2.7 million on buildings and equipment. Money in: $66 million local (mostly property tax), $24.4 million state, $6.3 million federal. Long-term debt: $91.9 million.
Spent $108.1 million — $98.3 million to run schools, about $16,637 per student, plus $2.3 million on buildings and equipment. Money in: $83.2 million local (mostly property tax), $22.4 million state, $17.3 million federal. Long-term debt: $156.7 million.
Spent $151 million — $92.8 million to run schools, about $16,334 per student, plus $50.6 million on buildings and equipment. Money in: $89.7 million local (mostly property tax), $12.5 million state, $5.8 million federal. Long-term debt: $145.3 million.
Spent $57 million — $50.1 million to run schools, about $11,484 per student, plus $3.1 million on buildings and equipment. Money in: $33.4 million local (mostly property tax), $18.2 million state, $8.5 million federal. Long-term debt: $45.9 million.
Spent $63 million — $57.6 million to run schools, about $13,593 per student, plus $3.8 million on buildings and equipment. Money in: $42.4 million local (mostly property tax), $17.7 million state, $4.3 million federal. Long-term debt: $2.8 million.
And 15 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 Hamilton County about $221.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
782 bridges in Hamilton County: 447 in good condition, 313 fair, and 22 poor (2.8%). “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.
| IR 75 over TRIBUTARY MILL CREEK · built 1960 | 91,244 vehicles a day |
| NB IR 75 over MILL CR;BENSON ST;NSRR;S · built 1965 | 67,075 vehicles a day |
| WESTERN HILLS VIAD over Mill Creek State Sprin · built 1931 | 43,788 vehicles a day |
| WINTON ROAD over WINTON WOODS PARK DRIVE · built 1969 | 40,186 vehicles a day |
| WB IR 74 over CR 184;TRIB TAYLOR CREEK · built 1964 | 36,784 vehicles a day |
| WB IR 275 over CR 299(LOVELAND RD);IORY · built 1970 | 35,701 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $709.6 million of work in Hamilton County in fiscal 2025, about $854 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.
Registration deadlines, early voting and polling places for Ohio are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Hamilton 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 Hamilton County built: brayden.ozark@gmail.com.
More of Ohio: the state government and every county in Ohio.
Nearby counties: Butler County (17 mi) · Kenton County, KY (18 mi) · Campbell County, KY (19 mi) · Boone County, KY (19 mi) · Clermont County (23 mi) · Dearborn County, IN (23 mi).