62,068 people (2024 Census estimate, −0.9% since 2020)
1,270 square miles of land · 49 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.
33 active community water systems list Walla Walla County in the area they serve, reporting 66,043 people served in all (a system that crosses county lines counts its whole population).
| WALLA WALLA WATER DIVISION surface water · local government · WA5392500 | 42,959 served |
| COLLEGE PLACE WATER DEPT groundwater · local government · WA5314050 | 8,147 served |
| Snake River Housing Water System groundwater · private · WA5300710 | 3,036 served |
| Waitsburg City of groundwater · local government · WA5392250 | 1,817 served |
| CONSOLIDATED IRRIGATION DIST 14 groundwater · local government · WA5314650 | 1,555 served |
| WALLA WALLA UNIVERSITY groundwater · private · WA5392470 | 1,273 served |
| VALLE LINDO HOMES groundwater · local government · WA5392475 | 787 served |
| VETERANS AFFAIR MED CTR DEPT OF groundwater · federal · WA5390542 | 785 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 46 people were held in Walla Walla County's jail, in Vera's latest figure (2021), or 117 per 100,000 residents ages 15–64. In 2016 it was about 80.
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.
7 school districts have their office in Walla Walla County. School taxes are usually the largest part of a property tax bill.
Spent $109.4 million — $95.3 million to run schools, about $17,029 per student, plus $11.3 million on buildings and equipment. Money in: $18.7 million local (mostly property tax), $78.3 million state, $14.5 million federal. Long-term debt: $52.8 million.
Spent $28.7 million — $26.6 million to run schools, about $17,142 per student, plus $331,000 on buildings and equipment. Money in: $7.3 million local (mostly property tax), $19.5 million state, $3.4 million federal. Long-term debt: $22.6 million.
Spent $15.3 million — $14.5 million to run schools, about $19,710 per student, plus $646,000 on buildings and equipment. Money in: $3.5 million local (mostly property tax), $10.2 million state, $2 million federal. Long-term debt: $1 million.
Spent $5.9 million — $5.5 million to run schools, about $18,307 per student, plus $89,000 on buildings and equipment. Money in: $1.1 million local (mostly property tax), $3.8 million state, $730,000 federal. Long-term debt: $3.1 million.
Spent $8.1 million — $7.4 million to run schools, about $28,226 per student, plus $475,000 on buildings and equipment. Money in: $1.5 million local (mostly property tax), $4.3 million state, $1.2 million federal. Long-term debt: $1.7 million.
Spent $5.1 million — $4.9 million to run schools, about $24,123 per student, plus $42,000 on buildings and equipment. Money in: $1.4 million local (mostly property tax), $3.7 million state, $550,000 federal. Long-term debt: $5.4 million.
Spent $1 million — $759,000 to run schools, about $47,438 per student, plus $153,000 on buildings and equipment. Money in: $237,000 local (mostly property tax), $652,000 state, $74,000 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 Walla Walla County about $20.3 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
195 bridges in Walla Walla County: 121 in good condition, 56 fair, and 18 poor (9.2%). “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 12 over NINE MILE CR & RR · built 1933 | 8,140 vehicles a day |
| US 12 over WB OFF RAMP · built 1971 | 4,350 vehicles a day |
| 4TH ST over MILL CREEK · built 1908 | 2,624 vehicles a day |
| 6TH ST over MILL CREEK · built 1920 | 1,970 vehicles a day |
| 5TH ST over MILL CREEK · built 1916 | 1,970 vehicles a day |
| WALLULA AVE over MILL CREEK · built 1947 | 948 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $29.7 million of work in Walla Walla County in fiscal 2025, about $474 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 Washington 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 Walla Walla 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 Walla Walla County built: brayden.ozark@gmail.com.
More of Washington: the state government and every county in Washington.
Nearby counties: Columbia County (27 mi) · Franklin County (28 mi) · Garfield County (47 mi) · Umatilla County, OR (47 mi) · Benton County (49 mi) · Adams County (52 mi).