138,727 people (2024 Census estimate, +1.4% since 2020)
431 square miles of land · 322 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.
15 active community water systems list Washington County in the area they serve, reporting 88,671 people served in all (a system that crosses county lines counts its whole population).
| WEST BEND WATERWORKS groundwater · local government · WI2670120 | 32,149 served |
| GERMANTOWN WATER UTILITY groundwater · local government · WI2670105 | 20,027 served |
| HARTFORD WATERWORKS groundwater · local government · WI2670110 | 15,805 served |
| JACKSON WATERWORKS groundwater · local government · WI2670111 | 8,397 served |
| SLINGER WATER UTILITY groundwater · local government · WI2670116 | 5,659 served |
| KEWASKUM WATERWORKS groundwater · local government · WI2670112 | 4,309 served |
| ALLENTON SANITARY DISTRICT groundwater · local government · WI2670104 | 860 served |
| CEDAR LAKE HOME 5 groundwater · private · WI2670123 | 330 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 232 people were held in Washington County's jail, in Vera's latest figure (2025). In 2020 it was about 151.
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 Washington County. School taxes are usually the largest part of a property tax bill.
Spent $90.5 million — $80.5 million to run schools, about $14,043 per student, plus $549,000 on buildings and equipment. Money in: $42 million local (mostly property tax), $48.3 million state, $10.7 million federal. Long-term debt: $12.1 million.
Spent $52.5 million — $47.7 million to run schools, about $12,223 per student, plus $1.2 million on buildings and equipment. Money in: $36.1 million local (mostly property tax), $27.4 million state, $4.7 million federal. Long-term debt: $89.9 million.
Spent $42.8 million — $39 million to run schools, about $11,642 per student, plus $1.8 million on buildings and equipment. Money in: $22.1 million local (mostly property tax), $23 million state, $3.9 million federal. Long-term debt: $28.9 million.
Spent $26.6 million — $21.5 million to run schools, about $12,010 per student, plus $1.8 million on buildings and equipment. Money in: $12 million local (mostly property tax), $14.2 million state, $2.7 million federal. Long-term debt: $25.7 million.
Spent $25.3 million — $20.7 million to run schools, about $13,650 per student, plus $233,000 on buildings and equipment. Money in: $10.6 million local (mostly property tax), $16.9 million state, $2.5 million federal. Long-term debt: $7.4 million.
Spent $24 million — $20.4 million to run schools, about $15,498 per student, plus $1 million on buildings and equipment. Money in: $11.7 million local (mostly property tax), $10.8 million state, $2 million federal. Long-term debt: $6.6 million.
Spent $9.4 million — $7.9 million to run schools, about $16,435 per student, plus $616,000 on buildings and equipment. Money in: $5.5 million local (mostly property tax), $3.1 million state, $599,000 federal. Long-term debt: $555,000.
Spent $5.6 million — $4.5 million to run schools, about $11,308 per student, plus $273,000 on buildings and equipment. Money in: $3.6 million local (mostly property tax), $1.4 million state, $809,000 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Washington County about $48.4 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
164 bridges in Washington County: 68 in good condition, 83 fair, and 13 poor (7.9%). “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.
| STH 167 over IH 41-USH 45 · built 1969 | 12,200 vehicles a day |
| CTH A over MILWAUKEE RIVER · built 1952 | 2,400 vehicles a day |
| CTH G over BR CEDAR CREEK · built 1956 | 1,391 vehicles a day |
| LRD JAY DR over N BR MILWAUKEE RIVER · built 1978 | 750 vehicles a day |
| LRD MIDLAND DR over KOHLSVILLE RIVER · built 1926 | 395 vehicles a day |
| LRD TOWNLINE RD over TRIB. TO MILWAUKEE R · built 1930 | 219 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $14 million of work in Washington County in fiscal 2025, about $102 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 Wisconsin 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 Wisconsin: the state government and every county in Wisconsin.
Nearby counties: Ozaukee County (21 mi) · Dodge County (24 mi) · Waukesha County (26 mi) · Fond du Lac County (28 mi) · Sheboygan County (35 mi) · Jefferson County (38 mi).