5,750 people (2024 Census estimate, −3.8% since 2020)
648 square miles of land · 9 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.
7 active community water systems list Sullivan County in the area they serve, reporting 7,193 people served in all (a system that crosses county lines counts its whole population).
| SULLIVAN COUNTY PWSD 1 buys surface water · local government · MO2024594 | 4,412 served |
| MILAN PWS buys surface water · local government · MO2010523 | 1,759 served |
| GREEN CITY PWS buys surface water · local government · MO2010329 | 578 served |
| GREEN CASTLE PWS buys surface water · local government · MO2010328 | 212 served |
| NEWTOWN PWS buys surface water · local government · MO2010574 | 109 served |
| HUMPHREYS PWS buys surface water · local government · MO2010389 | 98 served |
| NORTH CENTRAL MO REGIONAL WATER COM surface water · local government · MO2021537 | 25 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 1 people were held in Sullivan County's jail, in Vera's latest figure (2013), or 25 per 100,000 residents ages 15–64. In 2008 it was about 3.
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.
3 school districts have their office in Sullivan County. School taxes are usually the largest part of a property tax bill.
Spent $9.5 million — $8.4 million to run schools, about $12,796 per student, plus $1.1 million on buildings and equipment. Money in: $3.3 million local (mostly property tax), $5 million state, $1.4 million federal.
Spent $4.3 million — $4 million to run schools, about $14,888 per student, plus $98,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $2.1 million state, $623,000 federal. Long-term debt: $3.3 million.
Spent $1.8 million — $1.8 million to run schools, about $21,728 per student. Money in: $890,000 local (mostly property tax), $681,000 state, $187,000 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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Sullivan County about $4.4 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
221 bridges in Sullivan County: 124 in good condition, 81 fair, and 16 poor (7.2%). “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.
| RT OO S over LOCUST CR · built 1961 | 572 vehicles a day |
| RT N E over LIT YELLOW CR · built 1922 | 435 vehicles a day |
| RT T S over E LOCUST CR · built 1949 | 267 vehicles a day |
| MO 129 S over SPRING CR · built 1950 | 78 vehicles a day |
| MO 129 S over N SPRING CR · built 1950 | 78 vehicles a day |
| RT PP E over W LOCUST CR · built 1955 | 72 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $13.8 million of work in Sullivan County in fiscal 2025, about $2,292 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 Missouri 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 Missouri: the state government and every county in Missouri.
Nearby counties: Putnam County (19 mi) · Linn County (24 mi) · Grundy County (25 mi) · Adair County (27 mi) · Mercer County (28 mi) · Schuyler County (36 mi).