23,583 people (2024 Census estimate, +0.6% since 2020)
760 square miles of land · 31 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 Washington County in the area they serve, reporting 5,446 people served in all (a system that crosses county lines counts its whole population).
| POTOSI PWS groundwater · local government · MO6010659 | 2,527 served |
| POTOSI EAST groundwater · state · MO6069096 | 900 served |
| WASHINGTON COUNTY PWSD 1 buys groundwater · local government · MO6024633 | 503 served |
| IRONDALE PWS groundwater · local government · MO6010401 | 420 served |
| MO AMERICAN ROGUE CREEK UTILITIES groundwater · private · MO4036318 | 276 served |
| MINERAL POINT PWS groundwater · local government · MO4011123 | 231 served |
| ANTHONIES MILL RESORT SUBDIVISION groundwater · private · MO4036311 | 214 served |
| WASHINGTON COUNTY PWSD 2 groundwater · local government · MO4021447 | 175 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 61 people were held in Washington County's jail, in Vera's latest figure (2019), or 397 per 100,000 residents ages 15–64. In 2014 it was about 46.
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.
4 school districts have their office in Washington County. School taxes are usually the largest part of a property tax bill.
Spent $24.1 million — $22.5 million to run schools, about $11,029 per student, plus $1.1 million on buildings and equipment. Money in: $6.7 million local (mostly property tax), $16.2 million state, $4.1 million federal. Long-term debt: $6 million.
Spent $11.5 million — $9.6 million to run schools, about $11,481 per student, plus $1.6 million on buildings and equipment. Money in: $3.5 million local (mostly property tax), $6.7 million state, $3.5 million federal. Long-term debt: $2.3 million.
Spent $5.6 million — $5.2 million to run schools, about $14,920 per student, plus $362,000 on buildings and equipment. Money in: $2.1 million local (mostly property tax), $3.2 million state, $574,000 federal.
Spent $3 million — $2.5 million to run schools, about $16,437 per student, plus $59,000 on buildings and equipment. Money in: $805,000 local (mostly property tax), $1.9 million state, $1 million 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Washington County about $19.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
156 bridges in Washington County: 48 in good condition, 91 fair, and 17 poor (10.9%). “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.
| MO 8 E over UP RR · built 1968 | 6,462 vehicles a day |
| MO 8 E over N FK FOURCHE-A-REN · built 1965 | 3,815 vehicles a day |
| MO 47 S over MILL CR · built 1964 | 3,312 vehicles a day |
| RT U S over WALLEN CR · built 1956 | 1,124 vehicles a day |
| MO 185 S over MILLERS SWAN BR · built 1961 | 706 vehicles a day |
| RT C E over BIG RVR · built 1934 | 668 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $10.2 million of work in Washington County in fiscal 2025, about $432 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 Washington 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 Washington County built: brayden.ozark@gmail.com.
More of Missouri: the state government and every county in Missouri.
Nearby counties: Crawford County (23 mi) · Iron County (24 mi) · St. Francois County (25 mi) · Jefferson County (29 mi) · Franklin County (34 mi) · Dent County (40 mi).