379,704 people (2024 Census estimate, +8.8% since 2020)
394 square miles of land · 963 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.
16 active community water systems list Hamilton County in the area they serve, reporting 220,554 people served in all (a system that crosses county lines counts its whole population).
| CARMEL WATER DEPARTMENT groundwater (surface-influenced) · local government · IN5229004 | 99,927 served |
| CITIZENS WATER OF WESTFIELD, LLC groundwater · private · IN5229009 | 61,493 served |
| INDIANA AMERICAN WATER - NOBLESVILLE groundwater · private · IN5229015 | 45,575 served |
| CICERO WATER DEPARTMENT groundwater · local government · IN5229005 | 5,607 served |
| INDIANA AMERICAN WATER - SHERIDAN groundwater · local government · IN5229014 | 4,435 served |
| ARCADIA WATER DEPARTMENT groundwater · local government · IN5229001 | 1,515 served |
| ATLANTA WATER DEPARTMENT groundwater · local government · IN5229002 | 735 served |
| CARMEL CLAY WATER buys surface water · local government · IN5229024 | 393 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 362 people were held in Hamilton County's jail, in Vera's latest figure (2024), or 149 per 100,000 residents ages 15–64. In 2019 it was about 373.
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.
6 school districts have their office in Hamilton County. School taxes are usually the largest part of a property tax bill.
Spent $317.3 million — $267.2 million to run schools, about $12,362 per student, plus $48.9 million on buildings and equipment. Money in: $137.2 million local (mostly property tax), $182.6 million state, $14.3 million federal. Long-term debt: $241.8 million.
Spent $274 million — $216.5 million to run schools, about $13,470 per student, plus $49.9 million on buildings and equipment. Money in: $115.7 million local (mostly property tax), $143.5 million state, $11.3 million federal. Long-term debt: $144.5 million.
Spent $145 million — $124.9 million to run schools, about $11,810 per student, plus $18.8 million on buildings and equipment. Money in: $104 million local (mostly property tax), $79.2 million state, $11.5 million federal. Long-term debt: $172.7 million.
Spent $169.9 million — $119.5 million to run schools, about $13,022 per student, plus $39.8 million on buildings and equipment. Money in: $74.4 million local (mostly property tax), $81.7 million state, $6.3 million federal. Long-term debt: $163.4 million.
Spent $34.2 million — $26.3 million to run schools, about $11,407 per student, plus $4.9 million on buildings and equipment. Money in: $14.9 million local (mostly property tax), $20.4 million state, $1.6 million federal. Long-term debt: $60.2 million.
Spent $19.3 million — $15 million to run schools, about $13,896 per student, plus $2.5 million on buildings and equipment. Money in: $8.6 million local (mostly property tax), $10.8 million state, $940,000 federal. Long-term debt: $33.4 million.
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 Hamilton County about $129 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.
460 bridges in Hamilton County: 315 in good condition, 134 fair, and 11 poor (2.4%). “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.
| LITTLE CHICAGO RD over MORSE RESERVOIR · built 1954 | 15,750 vehicles a day |
| 106TH ST EAST over MUD CREEK · built 1980 | 11,970 vehicles a day |
| HAZELDELL PKWY over COOL CREEK · built 1998 | 11,260 vehicles a day |
| CHERRY TREE RD over VESTAL DITCH · built 1974 | 1,670 vehicles a day |
| ATLANTIC AVE over STONY CREEK · built 1978 | 570 vehicles a day |
| EAGLETOWN RD over LITTLE EAGLE CREEK · built 1976 | 500 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $49.1 million of work in Hamilton County in fiscal 2025, about $141 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 Indiana 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 Indiana: the state government and every county in Indiana.
Nearby counties: Madison County (18 mi) · Tipton County (18 mi) · Marion County (20 mi) · Hancock County (21 mi) · Boone County (24 mi) · Clinton County (30 mi).