26,421 people (2024 Census estimate, −0.2% since 2020)
373 square miles of land · 71 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.
5 active community water systems list Decatur County in the area they serve, reporting 20,411 people served in all (a system that crosses county lines counts its whole population).
| GREENSBURG MUNICIPAL WATER WORKS surface water · local government · IN5216002 | 12,650 served |
| DECATUR CO. WATER CORP. buys surface water · local government · IN5216008 | 3,440 served |
| WESTPORT WATER COMPANY surface water · local government · IN5216005 | 1,725 served |
| LAKE SANTEE RWWD surface water · local government · IN5216003 | 1,500 served |
| ST. PAUL MUNICIPAL WATER groundwater · local government · IN5216004 | 1,096 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 142 people were held in Decatur County's jail, in Vera's latest figure (2024), or 858 per 100,000 residents ages 15–64. In 2019 it was about 136.
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.
2 school districts have their office in Decatur County. School taxes are usually the largest part of a property tax bill.
Spent $28.8 million — $24.5 million to run schools, about $11,389 per student, plus $3.1 million on buildings and equipment. Money in: $8.4 million local (mostly property tax), $16.8 million state, $3.8 million federal. Long-term debt: $34.1 million.
Spent $30 million — $24.9 million to run schools, about $13,673 per student, plus $2.1 million on buildings and equipment. Money in: $8.9 million local (mostly property tax), $17.2 million state, $2.5 million federal. Long-term debt: $45.7 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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Decatur County about $12.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
220 bridges in Decatur County: 73 in good condition, 134 fair, and 13 poor (5.9%). “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.
| MAIN ST over MILLSTONE CREEK · built 1935 | 1,210 vehicles a day |
| CR 700W over CLIFTY CREEK · built 1890 | 430 vehicles a day |
| CR 900S over SQUARE RUN · built 1925 | 250 vehicles a day |
| CR 200S over CLIFTY CREEK · built 1912 | 180 vehicles a day |
| CR 225E over MIDDLE FORK CLIFTY CREEK · built 1890 | 140 vehicles a day |
| CR 400E over SOUTH BR CLIFTY CREEK · built 1975 | 140 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $5.2 million of work in Decatur County in fiscal 2025, about $195 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 Decatur 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 Decatur County built: brayden.ozark@gmail.com.
More of Indiana: the state government and every county in Indiana.
Nearby counties: Ripley County (19 mi) · Shelby County (22 mi) · Rush County (22 mi) · Bartholomew County (22 mi) · Jennings County (22 mi) · Franklin County (24 mi).