8,186 people (2024 Census estimate, +0.4% since 2020)
723 square miles of land · 11 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.
9 active community water systems list Harrison County in the area they serve, reporting 12,405 people served in all (a system that crosses county lines counts its whole population).
| HARRISON COUNTY PWSD 2 groundwater · local government · MO1024242 | 3,740 served |
| BETHANY PWS surface water · local government · MO1010068 | 3,292 served |
| MERCER COUNTY PWSD 1 buys surface water · local government · MO2024382 | 3,200 served |
| HARRISON COUNTY PWSD 1 buys groundwater · local government · MO1024241 | 823 served |
| GILMAN CITY PWS buys groundwater · local government · MO1010306 | 380 served |
| RIDGEWAY PWS buys groundwater · local government · MO1010688 | 372 served |
| CAINSVILLE PWS buys groundwater · local government · MO1010122 | 290 served |
| NEW HAMPTON PWS buys groundwater · local government · MO1010567 | 283 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 16 people were held in Harrison County's jail, in Vera's latest figure (2019), or 337 per 100,000 residents ages 15–64. In 2014 it was about 18.
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.
5 school districts have their office in Harrison County. School taxes are usually the largest part of a property tax bill.
Spent $12.9 million — $11 million to run schools, about $13,649 per student, plus $1.8 million on buildings and equipment. Money in: $4.9 million local (mostly property tax), $4.9 million state, $3.1 million federal.
Spent $3.3 million — $3 million to run schools, about $13,013 per student, plus $88,000 on buildings and equipment. Money in: $1.6 million local (mostly property tax), $1.4 million state, $335,000 federal.
Spent $2.3 million — $2.2 million to run schools, about $12,694 per student, plus $50,000 on buildings and equipment. Money in: $1 million local (mostly property tax), $883,000 state, $323,000 federal.
Spent $1.7 million — $1.6 million to run schools, about $17,135 per student. Money in: $587,000 local (mostly property tax), $984,000 state, $307,000 federal.
Spent $2.4 million — $1.7 million to run schools, about $21,641 per student, plus $697,000 on buildings and equipment. Money in: $644,000 local (mostly property tax), $831,000 state, $514,000 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 Harrison County about $7.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
331 bridges in Harrison County: 131 in good condition, 126 fair, and 74 poor (22.4%). “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.
| US 136 E over IS 35 · built 1973 | 4,757 vehicles a day |
| MO 13 S over IS 35 · built 1973 | 1,898 vehicles a day |
| RT N E over IS 35 · built 1968 | 933 vehicles a day |
| US 69 S over ZADIE BR · built 1925 | 390 vehicles a day |
| 20TH ST over BUCKS BR · built 1920 | 300 vehicles a day |
| 16TH ST over BUCKS BR · built 1930 | 300 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $6.2 million of work in Harrison County in fiscal 2025, about $759 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 Harrison 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 Harrison County built: brayden.ozark@gmail.com.
More of Missouri: the state government and every county in Missouri.
Nearby counties: Mercer County (23 mi) · Gentry County (24 mi) · Worth County (24 mi) · Daviess County (26 mi) · Grundy County (28 mi) · Decatur County, IA (29 mi).