51,462 people (2024 Census estimate, −0.8% since 2020)
598 square miles of land · 86 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.
11 active community water systems list Darke County in the area they serve, reporting 25,006 people served in all (a system that crosses county lines counts its whole population).
| GREENVILLE CITY PWS surface water · local government · OH1900714 | 13,227 served |
| VERSAILLES VILLAGE PWS groundwater · local government · OH1901312 | 2,687 served |
| ARCANUM VILLAGE PWS groundwater · local government · OH1900112 | 2,100 served |
| BRADFORD VILLAGE PWS groundwater · local government · OH1900212 | 2,000 served |
| UNION CITY VILLAGE PWS buys groundwater · local government · OH1901212 | 1,650 served |
| ANSONIA VILLAGE PWS groundwater · local government · OH1900012 | 1,174 served |
| NEW MADISON VILLAGE PWS groundwater · local government · OH1900912 | 892 served |
| SHERWOOD FOREST MHP PWS groundwater · private · OH1901112 | 578 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 20 people were held in Darke County's jail, in Vera's latest figure (2023), or 65 per 100,000 residents ages 15–64. In 2018 it was about 31.
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.
8 school districts have their office in Darke County. School taxes are usually the largest part of a property tax bill.
Spent $36.5 million — $32.9 million to run schools, about $13,880 per student, plus $1.6 million on buildings and equipment. Money in: $19.8 million local (mostly property tax), $13.9 million state, $3.7 million federal. Long-term debt: $38.4 million.
Spent $28.6 million — $17.4 million to run schools, about $13,824 per student, plus $10.4 million on buildings and equipment. Money in: $9.6 million local (mostly property tax), $9.2 million state, $1.2 million federal. Long-term debt: $7.5 million.
Spent $15.8 million — $14.1 million to run schools, about $11,996 per student, plus $681,000 on buildings and equipment. Money in: $7.7 million local (mostly property tax), $7.8 million state, $1.4 million federal. Long-term debt: $9.1 million.
Spent $19.5 million — $10.2 million to run schools, about $12,141 per student, plus $8.5 million on buildings and equipment. Money in: $6.1 million local (mostly property tax), $6.2 million state, $1.1 million federal. Long-term debt: $7.8 million.
Spent $11.9 million — $10.4 million to run schools, about $12,981 per student, plus $762,000 on buildings and equipment. Money in: $4.6 million local (mostly property tax), $6.8 million state, $1.3 million federal. Long-term debt: $1.3 million.
Spent $11.6 million — $9.8 million to run schools, about $15,201 per student, plus $1 million on buildings and equipment. Money in: $4.7 million local (mostly property tax), $5.8 million state, $1.7 million federal. Long-term debt: $150,000.
Spent $9.1 million — $8.2 million to run schools, about $15,996 per student, plus $291,000 on buildings and equipment. Money in: $4 million local (mostly property tax), $4.5 million state, $797,000 federal. Long-term debt: $5.6 million.
Spent $11.1 million — $8.1 million to run schools, about $16,747 per student, plus $2.6 million on buildings and equipment. Money in: $4 million local (mostly property tax), $4.9 million state, $1.3 million federal. Long-term debt: $3.5 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Darke County about $20.3 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.
463 bridges in Darke County: 386 in good condition, 75 fair, and 2 poor (0.4%). “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.
| RHYNARD-FINK over NORTH FORK OF STILLWATER · built 1977 | 797 vehicles a day |
| WOODS over ROSS LATERAL · built 1983 | 351 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $8.4 million of work in Darke County in fiscal 2025, about $162 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 Ohio 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 Darke 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 Darke County built: brayden.ozark@gmail.com.
More of Ohio: the state government and every county in Ohio.
Nearby counties: Randolph County, IN (20 mi) · Miami County (21 mi) · Shelby County (26 mi) · Preble County (27 mi) · Wayne County, IN (28 mi) · Mercer County (28 mi).