611,272 people (2024 Census estimate, +1.7% since 2020)
724 square miles of land · 844 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.
29 active community water systems list Washington County in the area they serve, reporting 586,189 people served in all (a system that crosses county lines counts its whole population).
| TUALATIN VALLEY WATER DISTRICT buys surface water · local government · OR4100665 | 224,600 served |
| HILLSBORO, CITY OF buys surface water · local government · OR4101513 | 92,632 served |
| BEAVERTON, CITY OF buys surface water · local government · OR4100081 | 88,045 served |
| TIGARD, CITY OF buys surface water · local government · OR4100878 | 62,500 served |
| TUALATIN, CITY OF buys surface water · local government · OR4100906 | 28,106 served |
| FOREST GROVE, CITY OF surface water · local government · OR4100305 | 26,838 served |
| SHERWOOD, CITY OF buys surface water · local government · OR4100816 | 20,781 served |
| CORNELIUS, CITY OF buys surface water · local government · OR4100218 | 14,490 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 423 people were held in Washington County's jail, in Vera's latest figure (2023), or 105 per 100,000 residents ages 15–64. In 2018 it was about 594.
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.
6 school districts have their office in Washington County. School taxes are usually the largest part of a property tax bill.
Spent $705.4 million — $620 million to run schools, about $16,018 per student, plus $50 million on buildings and equipment. Money in: $330.8 million local (mostly property tax), $376.5 million state, $44.2 million federal. Long-term debt: $860.1 million.
Spent $390.1 million — $319.6 million to run schools, about $16,892 per student, plus $43.9 million on buildings and equipment. Money in: $160 million local (mostly property tax), $183 million state, $29.5 million federal. Long-term debt: $519.2 million.
Spent $259.1 million — $207 million to run schools, about $17,758 per student, plus $34 million on buildings and equipment. Money in: $117.7 million local (mostly property tax), $95.4 million state, $14.3 million federal. Long-term debt: $307.6 million.
Spent $109.2 million — $99.7 million to run schools, about $17,256 per student, plus $5.9 million on buildings and equipment. Money in: $29.6 million local (mostly property tax), $68.3 million state, $11.6 million federal. Long-term debt: $59.9 million.
Spent $15.8 million — $15.4 million to run schools, about $14,460 per student, plus $139,000 on buildings and equipment. Money in: $5.9 million local (mostly property tax), $9.9 million state, $711,000 federal. Long-term debt: $6.8 million.
Spent $9.7 million — $8.4 million to run schools, about $17,495 per student, plus $268,000 on buildings and equipment. Money in: $2.7 million local (mostly property tax), $5.8 million state, $557,000 federal. Long-term debt: $13.6 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 High compared with other U.S. counties. FEMA estimates natural hazards cost Washington County about $270.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
334 bridges in Washington County: 96 in good condition, 227 fair, and 11 poor (3.3%). “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.
| SW 205TH AVE over BEAVERTON CREEK · built 1960 | 14,741 vehicles a day |
| Hwy 29 over PNWR & Scoggin Creek · built 1967 | 12,233 vehicles a day |
| US 26 (HWY 047) over West Fork Dairy Creek · built 1940 | 9,574 vehicles a day |
| HWY 140 over JACKSON BOTTOM SLOUGH · built 1966 | 8,728 vehicles a day |
| NORTH DAKOTA ST over FANNO CREEK · built 1962 | 6,925 vehicles a day |
| TIGARD STREET over FANNO CREEK · built 1958 | 5,667 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $131.2 million of work in Washington County in fiscal 2025, about $218 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 Oregon 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 Oregon: the state government and every county in Oregon.
Nearby counties: Yamhill County (24 mi) · Columbia County (27 mi) · Tillamook County (33 mi) · Multnomah County (33 mi) · Clark County, WA (33 mi) · Clatsop County (44 mi).