37,087 people (2024 Census estimate, +0.5% since 2020)
474 square miles of land · 78 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.
20 active community water systems list Clinton County in the area they serve, reporting 34,134 people served in all (a system that crosses county lines counts its whole population).
| BREESE surface water · local government · IL0270250 | 4,772 served |
| NEW BADEN buys surface water · local government · IL0274700 | 4,178 served |
| CARLYLE surface water · local government · IL0270300 | 3,373 served |
| TRENTON buys surface water · local government · IL0270500 | 2,742 served |
| AVISTON buys surface water · local government · IL0270100 | 2,545 served |
| CLINTON COUNTY EAST PWD buys surface water · local government · IL0275150 | 1,950 served |
| CARLYLE NORTH WATER COMPANY, INC. buys surface water · private · IL0270010 | 1,850 served |
| CARLYLE SOUTHWEST PWD buys surface water · local government · IL0275120 | 1,815 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 50 people were held in Clinton County's jail, in Vera's latest figure (2019), or 208 per 100,000 residents ages 15–64. In 2014 it was about 68.
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.
12 school districts have their office in Clinton County. School taxes are usually the largest part of a property tax bill.
Spent $18.9 million — $17.5 million to run schools, about $13,018 per student, plus $588,000 on buildings and equipment. Money in: $8 million local (mostly property tax), $10.9 million state, $1.8 million federal. Long-term debt: $6.6 million.
Spent $16.3 million — $14.8 million to run schools, about $15,425 per student, plus $883,000 on buildings and equipment. Money in: $7.5 million local (mostly property tax), $8.1 million state, $3.1 million federal. Long-term debt: $4.9 million.
Spent $11.5 million — $10.1 million to run schools, about $16,329 per student, plus $1.1 million on buildings and equipment. Money in: $8.7 million local (mostly property tax), $3.6 million state, $795,000 federal. Long-term debt: $4.3 million.
Spent $6.5 million — $5.9 million to run schools, about $9,717 per student, plus $160,000 on buildings and equipment. Money in: $3.9 million local (mostly property tax), $3.2 million state, $784,000 federal. Long-term debt: $2.1 million.
Spent $4.3 million — $3.7 million to run schools, about $8,725 per student, plus $314,000 on buildings and equipment. Money in: $6.2 million local (mostly property tax), $2.2 million state, $246,000 federal. Long-term debt: $911,000.
Spent $3.2 million — $2.7 million to run schools, about $11,280 per student, plus $278,000 on buildings and equipment. Money in: $1.3 million local (mostly property tax), $1.6 million state, $232,000 federal. Long-term debt: $3 million.
Spent $2.3 million — $2.2 million to run schools, about $12,535 per student, plus $103,000 on buildings and equipment. Money in: $1.3 million local (mostly property tax), $1.2 million state, $195,000 federal. Long-term debt: $71,000.
Spent $2.1 million — $1.8 million to run schools, about $10,933 per student, plus $184,000 on buildings and equipment. Money in: $967,000 local (mostly property tax), $1.2 million state, $196,000 federal. Long-term debt: $1.1 million.
And 4 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 Low compared with other U.S. counties. FEMA estimates natural hazards cost Clinton County about $27.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
190 bridges in Clinton County: 106 in good condition, 71 fair, and 13 poor (6.8%). “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.
| ALBERS RD/FAS 785 over GRASSY BRANCH · built 1973 | 2,700 vehicles a day |
| ILL 177 over QUEENS LAKE · built 1922 | 2,000 vehicles a day |
| FAS 1781 over BOND BRANCH · built 1963 | 950 vehicles a day |
| EMERALD RD over TRIB TO BEAVER CRK · built 1996 | 350 vehicles a day |
| TR 175 over PRAIRIE BRANCH · built 1940 | 300 vehicles a day |
| COURT ROAD/TR177 over LAKE BRANCH · built 1992 | 225 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $11.6 million of work in Clinton County in fiscal 2025, about $315 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 Illinois 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 Clinton 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 Clinton County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Washington County (17 mi) · Bond County (19 mi) · Marion County (27 mi) · St. Clair County (29 mi) · Madison County (30 mi) · Jefferson County (34 mi).