132,727 people (2024 Census estimate, −3.4% since 2020)
752 square miles of land · 177 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.
28 active community water systems list Napa County in the area they serve, reporting 123,972 people served in all (a system that crosses county lines counts its whole population).
| NAPA, CITY OF surface water · local government · CA2810003 | 84,804 served |
| AMERICAN CANYON, CITY OF surface water · local government · CA2810005 | 18,423 served |
| CALISTOGA, CITY OF surface water · local government · CA2810002 | 5,610 served |
| ST. HELENA, CITY OF surface water · local government · CA2810004 | 5,386 served |
| TOWN OF YOUNTVILLE buys surface water · local government · CA2810007 | 2,785 served |
| HOWELL MOUNTAIN MUTUAL WATER COMPANY surface water · private · CA2810001 | 1,244 served |
| VETERANS HOME OF CALIFORNIA surface water · state · CA2810008 | 1,000 served |
| PACIFIC UNION COLLEGE groundwater · private · CA2810012 | 758 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 216 people were held in Napa County's jail, in Vera's latest figure (2025). In 2020 it was about 199.
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 Napa County. School taxes are usually the largest part of a property tax bill.
Spent $281.1 million — $237.1 million to run schools, about $14,662 per student, plus $19.8 million on buildings and equipment. Money in: $190.5 million local (mostly property tax), $127.4 million state, $23.4 million federal. Long-term debt: $529.3 million.
Spent $47.3 million — $43.3 million to run schools, about $38,622 per student, plus $1.5 million on buildings and equipment. Money in: $43.3 million local (mostly property tax), $6.5 million state, $2.1 million federal. Long-term debt: $64.5 million.
Spent $26.9 million — $23.8 million to run schools, about $29,507 per student, plus $2 million on buildings and equipment. Money in: $21.5 million local (mostly property tax), $5.9 million state, $1.6 million federal. Long-term debt: $42.6 million.
Spent $2.6 million — $2.4 million to run schools, about $23,294 per student, plus $84,000 on buildings and equipment. Money in: $2.3 million local (mostly property tax), $849,000 state, $252,000 federal. Long-term debt: $2.5 million.
Spent $53.1 million — $41.8 million to run schools, about $444,926 per student, plus $731,000 on buildings and equipment. Money in: $37.6 million local (mostly property tax), $15.5 million state, $16.2 million federal. Long-term debt: $11.6 million.
Spent $2.2 million — $1.8 million to run schools, about $32,273 per student, plus $159,000 on buildings and equipment. Money in: $1.7 million local (mostly property tax), $881,000 state, $54,000 federal. Long-term debt: $3.9 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 Napa County about $186 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
160 bridges in Napa County: 71 in good condition, 81 fair, and 8 poor (5.0%). “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.
| STATE ROUTE 29 over NVRR NAPA RIVER STANLY · built 1977 | 48,000 vehicles a day |
| STATE ROUTE 29 SB over SUSCOL CREEK · built 1981 | 32,500 vehicles a day |
| STATE ROUTE 29 over GARNETT CREEK · built 1902 | 12,000 vehicles a day |
| KNOXV-BERRYESSA RD over POPE CRK.(LAKE BERRYESSA · built 1957 | 3,570 vehicles a day |
| DEER PARK ROAD over NAPA RIVER · built 1966 | 3,115 vehicles a day |
| DRY CR RD over DRY CREEK · built 1920 | 2,490 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $70.4 million of work in Napa County in fiscal 2025, about $510 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.
General election: Tuesday, November 3, 2026. Ballots mailed; drop boxes open: 2026-10-05. Last day to register to vote: 2026-10-19. Early in-person voting: 2026-10-24 to 2026-11-03. Election Day: 2026-11-03. Last day for mailed ballots to arrive: 2026-11-10.
Source: California Secretary of State — Nov. 3, 2026 key dates · California Official Voter Information Guide — dates to remember · California Secretary of State — make a plan to vote
The budget, property tax rates, audits, local officials and offices for Napa 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 Napa County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Yolo County (26 mi) · Solano County (27 mi) · Sonoma County (32 mi) · Marin County (39 mi) · Contra Costa County (45 mi) · Colusa County (47 mi).