County
Solano County
Solano County has an estimated 2025 population of 455,376 across about 821.738 square miles of land. The county handles work tied to parcels, records, elections, health, and countywide services. Cities inside it still set many permit and local-service rules.
Starting point
County offices handle the countywide work.
Start with county offices for records, taxes, elections, public health, social services, sheriff services, and work on unincorporated land. Court cases go through the state court system, including the superior court serving the county.
What changes the answer: Cities inside the county can still control city permits, local code, utilities, business licenses, and city-specific rules.
Countywide story
Grizzly Island shows Solano County's marsh side
Grizzly Island Wildlife Area sits in the Suisun Marsh, with wetland views, wildlife watching, trails, fishing, and seasonal hunting.
Read the local noteCounty offices
Start with the task in front of you.
Solano County handles countywide work and services on unincorporated land. Find the task below, then open the responsible office.
- Property Open the property-tax guide
Assessed value, exemptions, tax bills, and appeals
Solano County assessor handles value and exemptions. The clerk of the board handles a formal value appeal. The tax collector handles the bill, payment, and penalties.
- Records Open the records guide
Deeds, birth and death records, marriage records, and name changes
Solano County recorder is the usual office for deeds and many public records. Vital-record access depends on the record and year. A legal name change or divorce decree can involve Superior Court.
- Property work Open local-office help
Building permits, ADUs, zoning, code, water, and septic
For an unincorporated address, start with Solano County planning or building. An address inside a city or town starts with that local permit counter.
- Housing Open rent and housing help
Rent rules, repairs, notices, and eviction papers
Start with a local rent, housing, or code office if one serves the address. Court papers go to the Superior Court self-help path, and the deadline on the papers keeps running.
- Household help Open the benefits guide
CalFresh, Medi-Cal, CalWORKs, General Assistance, and IHSS
Solano County social-services agency is the main local office. Coverage, food, cash aid, and in-home support remain separate programs with separate notices.
- Public health Open health and benefits help
Vaccines, disease reporting, health records, and local health programs
Solano County public health is the local health jurisdiction. Health coverage and benefits still use separate programs and offices.
- Business Open the business guide
Business setup, seller's permits, local licenses, and regulated work
State filings and tax accounts do not replace county zoning, licensing, building, fire, or health approvals for the address.
- Neighborhood services Open local-office help
Potholes, streetlights, graffiti, trash, and service requests
For a county-maintained road or service in an unincorporated area, start with Solano County. Caltrans, utilities, transit systems, waste haulers, and special districts can own separate reporting paths.
- School and care Open the school and care guide
School enrollment, student records, and child-care checks
The school district handles assignment and records. County offices can help with some family services, while the state licenses child-care facilities.
- Parking Open parking help
Residential, guest, overnight, and local parking permits
A local parking permit is separate from a citation, moving ticket, and toll notice. Match the permit to the address, vehicle, district, or parking facility.
- Tickets Open ticket help
Traffic court, parking citations, and toll notices
Solano County Superior Court handles traffic court matters. A city or issuing agency handles parking. The toll operator handles toll notices.
- Safety Open emergency checks
Emergency alerts, evacuations, smoke, roads, and power
Use the county or city alert system for local warnings. Follow the local emergency office for evacuation wording, then check the matching state fire, smoke, road, or utility update.
Official county links
Open the office that handles the task.
The county links below come from California statewide directories and official county corrections. Property and recorder links open the state directory because several county offices can share one task.
Solano County
City, county, and district responsibilities
County and city rules can share one address.
An address in Solano County can sit inside a city. It can also sit on county land outside any city. That line picks the permit desk and some local rules. It does not move every county job to city hall.
County jobs stay with the county
The county assessor sets property value. The tax collector handles bills. The recorder, elections office, benefits office, and usually the health office also stay with Solano County. The court serves the county but is part of the state court system.
Permits follow the city line
A city or town usually handles permits, zoning, parking, business licenses, and local code inside its lines. Solano County handles these jobs on county land outside a city.
Districts can cross city and county lines
Water, sewer, fire, schools, transit, trash, and flood work may belong to a special district or other provider. The parcel or service bill is often the quickest way to name that agency.
Practical notes
Office, map, permit, and paperwork notes for Solano County
Community answer · Cars and driving · Reviewed July 7, 2026
Bay Area bridge tolls use FasTrak, plates, or invoices
Bay Area toll bridges use automatic toll collection, with FasTrak, License Plate Account, One-Time Payment, and invoice options depending on how the vehicle is set up.
Community answer · Rules and licenses · Reviewed July 3, 2026
A Solano County DBA starts with the County Clerk
Solano County fictitious business name filings start with the County Clerk and do not replace local license or permit checks.
Community answer · Money and taxes · Reviewed July 3, 2026
Solano County property tax questions split between record and bill
Solano County property tax questions usually start with the Assessor-Recorder for value and records, or the Tax Collector for bills and collections.
Community answer · Rules and licenses · Reviewed July 28, 2026
Fairfield permits use BUILD Online
Fairfield BUILD is the city's shared permit system for applications, plans, invoices, inspections, and case tracking.
Community answer · Rules and licenses · Reviewed July 28, 2026
Vallejo uses SeeClickFix for non-emergency maintenance issues
Vallejo routes non-emergency maintenance issues such as potholes and graffiti through SeeClickFix, while water leaks and emergencies use faster contacts.
Community answer · Home and property · Reviewed July 14, 2026
Fairfield's zone map and AlertSolano do different jobs
Genasys Protect identifies a Fairfield evacuation zone and its live status, while AlertSolano sends emergency notifications that use the same zone name.
Stories & Notes
Stories and local context across Solano County
Community story · History and culture
Mare Island keeps Vallejo's naval story in everyday view
Mare Island was the first U.S. naval station on the West Coast, and today Vallejo ties that history to reuse, businesses, trails, housing, schools, and open space.
Community story · History and culture
Vallejo was part of California's floating capital years
Before Sacramento became permanent, California's capital moved through several cities, and Vallejo twice held the Legislature while the young state searched for a workable home.
Community story · History and culture
The Jelly Belly factory gives Fairfield a sweet factory-tour stop
Fairfield's Jelly Belly Visitor Center connects candy history, self-guided factory tours, a public tour lane, and a family-friendly stop near I-80.
Community story · History and culture
Vallejo's old City Hall holds a Navy town's memory
The Vallejo Naval and Historical Museum connects local life with Mare Island, U.S. Navy history, city stories, and downtown heritage.
Community story · History and culture
The Vacaville Museum widens the story beyond one town
The Vacaville Museum preserves Solano County history and culture, giving Vacaville a local doorway into farms, towns, families, and change across the county.
Community story · History and culture
Travis gives Fairfield a major airlift story
Travis Air Force Base began as Fairfield-Suisun Army Air Base in World War II, and the Heritage Center helps connect Fairfield to aircraft, airlift, and Pacific history.
Community story · History and culture
Vacaville's Nut Tree began as a roadside fruit stand
The Nut Tree grew from a small 1921 fruit stand into a famous I-80 stop, making Vacaville part of California's roadside travel memory.
Community story · History and culture
Rio Vista kept its river-view name after moving to higher ground
Rio Vista began near Cache Slough, later moved to higher ground, and grew into a Sacramento River Delta town with a bridge, fishing, and river traffic.
- 2025 population
- 455,376
- Land area
- 821.738 sq mi
- Water area
- 84.406 sq mi