455,101 people (2024 Census estimate, +0.5% since 2020)
822 square miles of land · 554 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.
26 active community water systems list Solano County in the area they serve, reporting 460,498 people served in all (a system that crosses county lines counts its whole population).
| CITY OF VALLEJO surface water · local government · CA4810007 | 121,420 served |
| CITY OF FAIRFIELD surface water · local government · CA4810003 | 120,720 served |
| CITY OF VACAVILLE surface water · local government · CA4810008 | 99,650 served |
| SUISUN-SOLANO WATER AUTHORITY surface water · local government · CA4810005 | 29,105 served |
| CITY OF BENICIA surface water · local government · CA4810001 | 27,131 served |
| CALIFORNIA WATER SERVICE CO.-TRAVIS AFB buys surface water · federal · CA4810701 | 18,111 served |
| CITY OF DIXON groundwater · local government · CA4810009 | 12,540 served |
| CITY OF RIO VISTA groundwater · local government · CA4810004 | 11,206 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 496 people were held in Solano County's jail, in Vera's latest figure (2025). In 2020 it was about 565.
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 Solano County. School taxes are usually the largest part of a property tax bill.
Spent $347.6 million — $301.2 million to run schools, about $14,652 per student, plus $37.3 million on buildings and equipment. Money in: $107.3 million local (mostly property tax), $268.3 million state, $36 million federal. Long-term debt: $282.3 million.
Spent $228.2 million — $191.4 million to run schools, about $15,182 per student, plus $26 million on buildings and equipment. Money in: $76.7 million local (mostly property tax), $146.1 million state, $16.3 million federal. Long-term debt: $267.4 million.
Spent $221.6 million — $197.5 million to run schools, about $19,118 per student, plus $17.4 million on buildings and equipment. Money in: $66.5 million local (mostly property tax), $173.5 million state, $34.1 million federal. Long-term debt: $129.3 million.
Spent $80.5 million — $75.7 million to run schools, about $14,183 per student, plus $2.1 million on buildings and equipment. Money in: $19.5 million local (mostly property tax), $64.6 million state, $8.9 million federal. Long-term debt: $27.7 million.
Spent $78.6 million — $62.4 million to run schools, about $14,271 per student, plus $9.1 million on buildings and equipment. Money in: $34.8 million local (mostly property tax), $42.4 million state, $4 million federal. Long-term debt: $75.4 million.
Spent $49.8 million — $43.2 million to run schools, about $14,313 per student, plus $3.2 million on buildings and equipment. Money in: $19.1 million local (mostly property tax), $37.7 million state, $7.4 million federal. Long-term debt: $63.6 million.
Spent $33.9 million — $30.2 million to run schools, about $16,926 per student, plus $2.8 million on buildings and equipment. Money in: $19.7 million local (mostly property tax), $17.9 million state, $4 million federal. Long-term debt: $20.2 million.
Spent $95.8 million — $65.4 million to run schools, about $185,195 per student, plus $824,000 on buildings and equipment. Money in: $34.3 million local (mostly property tax), $50.2 million state, $14.6 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 High compared with other U.S. counties. FEMA estimates natural hazards cost Solano County about $292.1 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.
374 bridges in Solano County: 194 in good condition, 156 fair, and 24 poor (6.4%). “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.
| INTERSTATE 80 over SUISUN CREEK · built 1932 | 202,000 vehicles a day |
| INTERSTATE 80 over GREEN VALLEY CREEK · built 1928 | 189,000 vehicles a day |
| INTERSTATE 80 over ALAMO CREEK · built 1936 | 147,000 vehicles a day |
| INTERSTATE 80 WB over WEST TEXAS STREET · built 1961 | 87,500 vehicles a day |
| INTERSTATE 80 EB over WEST TEXAS STREET · built 1961 | 87,500 vehicles a day |
| INTERSTATE 80 WB over GIBSON CANYON CREEK · built 1965 | 60,750 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $280.6 million of work in Solano County in fiscal 2025, about $619 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 Solano 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 Solano County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Contra Costa County (24 mi) · Napa County (27 mi) · Yolo County (29 mi) · Sacramento County (35 mi) · San Joaquin County (43 mi) · Alameda County (43 mi).