46,015 people (2024 Census estimate, −0.9% since 2020)
695 square miles of land · 66 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 Clinton County in the area they serve, reporting 38,911 people served in all (a system that crosses county lines counts its whole population).
| IOWA-AMERICAN WTR CO-CLINTON DISTRICT groundwater · private · IA2326048 | 24,769 served |
| DE WITT WATER SUPPLY groundwater · local government · IA2330036 | 5,514 served |
| CAMANCHE WATER SUPPLY groundwater · local government · IA2322066 | 4,570 served |
| WHEATLAND CITY WATER SUPPLY groundwater · local government · IA2394017 | 775 served |
| GRAND MOUND WATER SUPPLY groundwater · local government · IA2341099 | 615 served |
| DELMAR WATER SUPPLY groundwater · local government · IA2328024 | 542 served |
| LOST NATION WATER SUPPLY groundwater · local government · IA2346047 | 434 served |
| CHARLOTTE WATER WORKS groundwater · local government · IA2324016 | 401 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 65 people were held in Clinton County's jail, in Vera's latest figure (2021), or 229 per 100,000 residents ages 15–64. In 2016 it was about 48.
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 Clinton County. School taxes are usually the largest part of a property tax bill.
Spent $79.5 million — $47.7 million to run schools, about $13,837 per student, plus $26.1 million on buildings and equipment. Money in: $18 million local (mostly property tax), $37 million state, $9.8 million federal. Long-term debt: $55.5 million.
Spent $22.7 million — $21 million to run schools, about $13,007 per student, plus $852,000 on buildings and equipment. Money in: $11.2 million local (mostly property tax), $12.7 million state, $1.2 million federal. Long-term debt: $11.1 million.
Spent $22.9 million — $13 million to run schools, about $13,114 per student, plus $8.7 million on buildings and equipment. Money in: $7.8 million local (mostly property tax), $7.1 million state, $950,000 federal. Long-term debt: $16 million.
Spent $11.8 million — $10.8 million to run schools, about $12,421 per student, plus $485,000 on buildings and equipment. Money in: $7.8 million local (mostly property tax), $4.7 million state, $719,000 federal. Long-term debt: $7.9 million.
Spent $8.3 million — $6 million to run schools, about $14,457 per student, plus $1.6 million on buildings and equipment. Money in: $3.8 million local (mostly property tax), $3.3 million state, $466,000 federal. Long-term debt: $2.8 million.
Spent $3.9 million — $2.3 million to run schools, about $14,182 per student, plus $346,000 on buildings and equipment. Money in: $1.8 million local (mostly property tax), $1.8 million state, $314,000 federal.
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 $25.4 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.
375 bridges in Clinton County: 261 in good condition, 102 fair, and 12 poor (3.2%). “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.
| HARTS MILL RD over MILL CREEK · built 1970 | 1,410 vehicles a day |
| ELVIRA RD over MILL CREEK · built 1962 | 1,360 vehicles a day |
| 290TH AVE over AMES CREEK · built 1971 | 1,220 vehicles a day |
| SECOND AVE RD over LITTLE MILL CREEK · built 1935 | 450 vehicles a day |
| 44TH AVE over ROCK CREEK · built 1985 | 370 vehicles a day |
| 432ND AVENUE over ELK RIVER · built 1968 | 310 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $29.8 million of work in Clinton County in fiscal 2025, about $641 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 Iowa 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 Iowa: the state government and every county in Iowa.
Nearby counties: Scott County (18 mi) · Jackson County (18 mi) · Rock Island County, IL (30 mi) · Cedar County (32 mi) · Carroll County, IL (34 mi) · Whiteside County, IL (34 mi).