County
Sonoma County
This is the county layer. It is often the first stop for assessor, tax collector, recorder, court, social service, election, health, sheriff, and unincorporated-area services.
Starting point
Start with the county layer.
County offices are the usual first stop for records, taxes, courts, elections, public health, social services, sheriff services, and unincorporated-area routing.
Cities inside the county can still control city permits, local code, utilities, business licenses, and city-specific rules.
2025 population
486,444
Land area
1,575.337 sq mi
Water area
192.005 sq mi
Directory notes
Local layers to keep on the same page.
Property, taxes, and records
For assessed value, exemptions, ownership records, recording, and tax bills, county offices are usually the starting layer.
Unincorporated land
If an address is outside city limits, county planning, building, environmental health, fire, or public works may handle local permits and code work.
Courts, services, and alerts
Superior court, sheriff, elections, social services, emergency alerts, and health offices often start at the county level.
Practical notes
Office, map, permit, and paperwork notes for Sonoma County
Place note · Rules and licenses · Reviewed July 7, 2026
MySantaRosa is the easy door for many non-emergency issues
MySantaRosa lets people report and track non-emergency city issues such as potholes, street light outages, slides, trees in the roadway, litter, and other concerns.
Place note · Cars and driving · Reviewed July 6, 2026
Santa Rosa CityBus is built around routes that meet and transfer
Santa Rosa CityBus has fixed routes inside city limits, a downtown Transit Mall, route maps, fares, passes, and paratransit links that make local bus trips easier to plan.
Place note · Home and property · Reviewed July 5, 2026
Petaluma building permits depend on the project lane
Petaluma's permit path splits building, zoning, right-of-way, fire, and business questions, so the project type matters as much as the address.
Place note · Home and property · Reviewed July 4, 2026
Petaluma Public Works issues can go through EngagePetaluma
Petaluma routes many Public Works and utilities problems through its report-an-issue path and EngagePetaluma app, with phone numbers for water and Public Works questions.
Place note · Home and property · Reviewed July 4, 2026
Rohnert Park's tracker lets you check existing requests
Rohnert Park's Citizen Request Tracker lets residents report routine concerns and check existing requests later, which is useful for follow-up.
Place note · Rules and licenses · Reviewed July 4, 2026
Santa Rosa parking depends on downtown, garage, lot, or neighborhood
Santa Rosa separates downtown parking, garages, lots, meters, citations, permits, and residential parking zones, so the right page depends on where the car will sit.
Almanac notes
Stories and local context near Sonoma County
Place note · History and culture
Santa Rosa's old post office became a museum by moving
The Museum of Sonoma County lives in Santa Rosa's historic 1910 post office, a building saved from demolition and moved to a new downtown spot.
Place note · History and culture
DeTurk Round Barn gives Santa Rosa's West End a rare old shape
DeTurk Round Barn sits in Santa Rosa's West End, tying the neighborhood to winery work, old industries, rail life, preservation, and a rare round-barn landmark.
Place note · History and culture
Cloverdale's History Center gathers the river, roads, and town life
Cloverdale's History Center and Gould-Shaw House Museum tie together Indigenous culture, lumber, citrus, stagecoaches, resorts, viticulture, and Russian River life.
Place note · History and culture
Cotati's six-sided plaza makes the whole town easier to remember
Cotati's downtown plaza grew from Page's Station and the old Rancho Cotate into a rare six-sided town plan now listed as a California Historical Landmark.
Place note · History and culture
Santa Rosa is home to a statewide California Indian cultural center
The California Indian Museum and Cultural Center in Santa Rosa shares California Indian history, culture, leadership, and living knowledge from a Native-led home base.
Place note · History and culture
Sebastopol still keeps Luther Burbank's outdoor workshop
Luther Burbank used his Gold Ridge farm in Sebastopol for decades of plant experiments, and the preserved farm still lets visitors walk through that living local history.
Place note · History and culture
Sonoma Plaza holds mission, Vallejo, and Bear Flag history
Sonoma Plaza was laid out in 1835, became a National Historic Landmark, and sits beside sites tied to Vallejo and the Bear Flag revolt.
Place note · History and culture
Fort Ross adds Russian and Kashaya history to the Sonoma Coast
Fort Ross State Historic Park near Jenner connects the Sonoma Coast to Russian settlement, Alaska trade routes, Kashaya Pomo homeland, ranching, archaeology, and ocean-edge history.