20,768 people (2024 Census estimate, −0.2% since 2020)
447 square miles of land · 46 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.
10 active community water systems list Sullivan County in the area they serve, reporting 19,012 people served in all (a system that crosses county lines counts its whole population).
| INDIANA AMERICAN WATER - SULLIVAN groundwater · private · IN5277009 | 6,598 served |
| SHELBURN WATER UTILITIES groundwater · local government · IN5277008 | 2,500 served |
| INDIANA AMERICAN WATER - FARMERSBURG buys groundwater · private · IN5277003 | 2,095 served |
| PAXTON WATER CORPORATION groundwater · local government · IN5277006 | 2,013 served |
| DUGGER UTILITIES buys groundwater · local government · IN5277002 | 1,935 served |
| CARLISLE WATER DEPARTMENT groundwater · local government · IN5277001 | 1,152 served |
| HYMERA WATER WORKS buys groundwater · local government · IN5277004 | 1,015 served |
| PLEASANTVILLE WATER COMPANY buys groundwater · local government · IN5277007 | 924 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 53 people were held in Sullivan County's jail, in Vera's latest figure (2024), or 390 per 100,000 residents ages 15–64. In 2019 it was about 66.
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 Sullivan County. School taxes are usually the largest part of a property tax bill.
Spent $28 million — $22.7 million to run schools, about $12,997 per student, plus $4.1 million on buildings and equipment. Money in: $8.4 million local (mostly property tax), $16.1 million state, $2.2 million federal. Long-term debt: $5.7 million.
Spent $13.2 million — $9.5 million to run schools, about $12,278 per student, plus $3.2 million on buildings and equipment. Money in: $3.8 million local (mostly property tax), $7.6 million state, $1.9 million federal. Long-term debt: $7.8 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 Sullivan County about $7.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
217 bridges in Sullivan County: 65 in good condition, 141 fair, and 11 poor (5.1%). “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.
| US 41 NB over BUSSERON CREEK · built 1972 | 6,687 vehicles a day |
| SR 154 over TURMAN CREEK · built 1946 | 2,300 vehicles a day |
| CR 350 S over UNNAMED DITCH · built 1930 | 1,020 vehicles a day |
| CR 75 N (90 N) over MORRISON CREEK · built 1935 | 190 vehicles a day |
| CR 1175 N over BRANCH OF TURMAN CREEK · built 1985 | 190 vehicles a day |
| CR 50 N over BUSSERON CREEK · built 1975 | 170 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $6 million of work in Sullivan County in fiscal 2025, about $287 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 Sullivan 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 Sullivan County built: brayden.ozark@gmail.com.
More of Indiana: the state government and every county in Indiana.
Nearby counties: Crawford County, IL (19 mi) · Greene County (22 mi) · Vigo County (24 mi) · Clark County, IL (26 mi) · Clay County (26 mi) · Knox County (28 mi).