Sonoma County, California
Sonoma County, California · educational cover · Santa Rosa is the seat · Sacramento is the capital · a vineyard is not the hall · Napa is not this county
Santa Rosa is the seat. Sacramento is the capital. A vineyard is not the hall.
Sonoma County, California, is one of the original twenty-seven California counties, created 18 February 1850. The name is the Coast Miwok and Pomo word for the valley, later the pueblo and the city. The City of Sonoma is not the county. Santa Rosa is the seat of this county today. Sacramento is the capital of California today. Wine on this map is work. A tasting room is not the Board. Staff who file “Sonoma the city as this hall,” or “Napa as this county,” or “a vineyard as this oval,” or park a Golden Gate postcard on Administration Drive, are on the wrong jurisdiction.
Nine incorporated places sit on this map: Santa Rosa, Petaluma, Rohnert Park, Windsor, Healdsburg, Cloverdale, Sebastopol, Cotati, and the City of Sonoma. Most of the acres remain unincorporated. The county is local government for that remainder, and countywide for elections, records, public health, courts support, and the jail. City halls do not become the Board because they are larger, or because one of them shares the county’s name.
This page is the place. For the Sheriff as an office, use the Sheriff briefing. For the oval, use the sheriff election briefing.
Five Supervisors at 575 Administration. They do not sit as the State Assembly.
A five-member Board of Supervisors sits at 575 Administration Drive, Santa Rosa. General law. They fund county departments. They do not hire the Sheriff. They do not sit as the State Assembly. They do not sit as Santa Rosa City Council or the City of Sonoma’s council. Other elected county officers the live listing actually names — District Attorney, Clerk-Recorder-Assessor, Auditor-Controller-Treasurer-Tax Collector — are this county’s desks, not Sacramento’s.
Registrar of Voters: 3880 Brickway Boulevard, Santa Rosa, CA 95403 — (707) 565-6800. The office moved here 2 February 2026 from 435 Fiscal Drive. That is county elections work. It is not Santa Rosa City Hall as this clerk. Confirm the live door on SoCoVotes before you travel.
The Pacific is an ocean. 101 is a road. Napa is a different county.
Sonoma is the North Coast county west of Napa. US 101 runs Santa Rosa, Windsor, Healdsburg, Cloverdale. SR 12 crosses the valley. SR 1 is the coast. The Russian River floods Guerneville and the west county. The Sonoma Coast is shoreline, not Marin as this oval, not San Francisco as this hall.
Marin County is south. Napa County is east. Lake County is northeast. Mendocino County is north. The Pacific is west. San Francisco is not this county. A wine-country label on a map does not move the hall into Napa.
Charles M. Schulz–Sonoma County Airport sits northwest of downtown Santa Rosa, next to the North County Detention Facility the Sheriff still lists. The airport is not the jail. The jail is not a vineyard.
How a North Coast public finds Ventura, Administration Drive, and the substations
- County government: sonomacounty.ca.gov — 575 Administration Drive, Santa Rosa.
- Sheriff-Coroner HQ: sonomasheriff.org — 2796 Ventura Avenue, Santa Rosa — (707) 565-2511. Emergency 911. Non-emergency (707) 565-2121.
- County jail this Sheriff still holds: Main Adult Detention Facility 2777 Ventura Avenue — (707) 565-1400. North County Detention Facility 2254 Ordinance Road — confirm whether that house is open.
- Coroner: 3336 Chanate Road, Santa Rosa — (707) 565-5070.
- Civil process: Civil Bureau at the Ventura shop — (707) 565-2751.
- River Substation: 1st and Church Streets, Guerneville — (707) 869-0202.
- Sonoma Valley Substation: 810 Grove Street, City of Sonoma — (707) 996-9495.
- Elections: Registrar of Voters, 3880 Brickway Boulevard, and the California Secretary of State.
- Courts: Superior Court work clusters on Administration Drive and Cleveland Avenue in Santa Rosa (Hall of Justice 625 Administration Drive, Civil and Family Law 3055 Cleveland Avenue, Juvenile Justice Center 7425 Rancho Los Guilicos Road). Confirm the live division before you travel. The court is not the Sheriff. The Sheriff is not the court.
911 versus non-emergency is a live split. A Santa Rosa city call is Santa Rosa Police. A Petaluma city call is Petaluma Police. Unincorporated remainder, and Windsor and the City of Sonoma under the Sheriff contracts, are this Sheriff. Do not invent a portal. Use the official doors.
2777 Ventura still jails. Santa Rosa PD does not. CDCR does not.
This county still jails at MADF this Sheriff holds. That is not Santa Rosa PD. That is not Petaluma PD. A state prison is CDCR. A family looking for a county booking who drives to 965 Sonoma Avenue is on the wrong door. The airport is the wrong gate for a county writ.
Windsor Police Department and Sonoma Police Department are Sonoma County Sheriff contracts. Deputies the Sheriff posts wear those cities’ cars. The cities remain cities. The oval remains this county’s. Confirm the live contracts on official pages. Santa Rosa, Petaluma, Rohnert Park, Healdsburg, Cloverdale, Sebastopol, and Cotati run their own police departments. A 2020s supplement inside a city, if the Board actually posted one, does not turn that city into unincorporated remainder. Confirm. Do not invent.
Care without inventing a vineyard postcard as this county government
Coroner work at 3336 Chanate. Indigent burial the Coroner actually administers. Disaster comfort the county’s emergency pages actually post. Flood on the Russian River. Fire in the hills. Do not invent a church. Do not invent a vineyard as this hall. Do not invent Napa as this county.
A student who wants this county’s civic path reads this Board, this Registrar at Brickway, this Sheriff at Ventura, and POST for the badge — not a Prattville swap, not a Napa academy, not a tasting room as a county school.
What Sonoma County actually watches
Court calendar on Administration Drive. A wreck on 101. Fire in the hills. Water on the Russian River. Wind on SR 1. A count at 2777 Ventura. Air operations at Schulz Airport as airspace and a neighbor, not as this badge. Coordination with seven city PDs, two Sheriff-contract cities, CHP, Marin’s Sheriff, Napa’s Sheriff, Mendocino’s Sheriff, and CDCR without becoming those departments. Agriculture in the valley is work. The river is weather and a flood beat. Neither is Napa as this oval.
Sonoma civic snapshot (verify official sources)
- State: California · County: Sonoma · Seat: Santa Rosa · Capital of California: Sacramento
- Map: Santa Rosa · Petaluma · Rohnert Park · Windsor · Healdsburg · Cloverdale · Sebastopol · Cotati · City of Sonoma (a city, not the hall) · Guerneville · US 101 · SR 12 · SR 1 · Russian River · Sonoma Coast
- Not a vineyard as the hall · Not Napa · Not Santa Rosa PD as this oval · Not Autauga-with-a-vineyard
- Board: five Supervisors at 575 Administration Drive (general law)
- Sheriff clock: not 2026 · last regular 2022 · next regular 2028 presidential primary · six-year bridge from AB 759 · not Santa Clara’s charter exception
- Jail: 2777 Ventura Avenue — this Sheriff still holds it
- Elections door: 3880 Brickway Boulevard (moved 2 February 2026 from Fiscal Drive)
Orientation adapted from the California Constitution Article XI, Elections Code § 1300, Government Code §§ 24000, 24200, 25304, and 26600, Sonoma County official pages (sonomacounty.ca.gov, sonomasheriff.org), and the Secretary of State for education. The Sheriff of record is whatever those sources say today. Confirm HQ versus court versus jail, Santa Rosa PD versus this badge, and the City of Sonoma versus this county, on official pages before you travel.
What Santa Rosa the city is not, as this county
- Not the capital of California. Sacramento is.
- Not the City of Sonoma as the county government. Not Petaluma / Healdsburg as this hall.
- Not Napa County. Not Marin as this oval. Not Mendocino as this oval.
- Not Santa Rosa Police as this oval. Not Petaluma Police as this oval. Not CHP. Not CDCR as this jailer.
- Not a vineyard as this county government. Not the Golden Gate as this hall.
- Not Autauga-with-a-vineyard. Not a wine-country postcard.
- Not the Governor (that desk is 2026 in Sacramento).
- Not a campaign flyer.