Maps
Interactive Maps
Sonoma County
- Election District Lookup: Shows boundaries of Congressional districts, State Senate districts, State Assembly districts, County Supervisorial districts, cities/towns, school districts, and special districts (fire districts, health care districts, life support districts, water districts, etc.) -- but only in Sonoma County.
Statewide
- California Citizens Redistricting Commission: Shows current boundaries of Congressional districts, State Board of Equalization districts, State Senate districts, and State Assembly districts for the entire state.
Downloadable Maps
Sonoma County Supervisorial Districts
- Full Supervisorial Map (PDF: 4.7 MB)
- Central Supervisorial District Boundary Map (PDF: 1.8 MB)
City Precinct Maps
For an explanation of what precinct numbers mean, see below.
- Cloverdale Precinct Map (PDF: 253 kB)
- Cotati Precinct Map (PDF: 359 kB)
- Healdsburg Precinct Map (PDF: 232 kB)
- Petaluma Precinct Map (PDF: 680 kB)
- Rohnert Park Precinct Map (PDF: 422 kB)
- Santa Rosa Precinct Map (PDF: 1.6 MB)
- Sebastopol Precinct Map (PDF: 175 kB)
- Sonoma Precinct Map (PDF: 323 Kb)
- Windsor Precinct Map (PDF: 364 kB)
What Precinct Numbers Mean
There are two main types of precincts: regular precincts and consolidated precincts.
Regular precincts are the smallest geographic unit for which voter data is compiled and aggregated. Regular precincts usually stay the same from one election to the next. The maps above display the boundaries of regular precincts.
Consolidated precincts are election-specific. They consist of a combination of two or more regular precincts.
In Sonoma County, all precincts (both regular and consolidated) consist of seven digits. The first digit is always zero. The second digit can be 1-5 or 7 (never 6, 8, or 9):
- If the second digit is 1-5, it's a regular precinct. The second digit indicates the supervisorial district, the third digit indicates the city/town/area (see table below), and the remaining four digits are random. Example: 0440001 would be in Supervisorial District 4 and the City of Healdsburg.
- If the second digit is 7, it's a consolidated precinct. The third digit indicates the supervisorial district, the fourth digit indicates the city/town/area (see table below), and the remaining three digits are random. Example: 0736011 would be in Supervisorial District 3 and the City of Rohnert Park.
| Precinct Type |
1st Digit |
2nd Digit |
3rd Digit |
4th Digit |
5th-7th Digits |
|---|---|---|---|---|---|
| Regular Precinct |
0 | 1 = 1st Sup Dist 2 = 2nd Sup Dist 3 = 3rd Sup Dist 4 = 4th Sup Dist 5 = 5th Sup Dist |
0 = Unincorporated Area 1 = City of Santa Rosa 2 = City of Cloverdale 3 = City of Cotati 4 = City of Healdsburg 5 = City of Petaluma 6 = City of Rohnert Park 7 = City of Sebastopol 8 = City of Sonoma 9 = Town of Windsor |
Random | Random |
| Consolidated Precinct |
0 | 7 | 1 = 1st Sup Dist 2 = 2nd Sup Dist 3 = 3rd Sup Dist 4 = 4th Sup Dist 5 = 5th Sup Dist |
0 = Unincorporated Area 1 = City of Santa Rosa 2 = City of Cloverdale 3 = City of Cotati 4 = City of Healdsburg 5 = City of Petaluma 6 = City of Rohnert Park 7 = City of Sebastopol 8 = City of Sonoma 9 = Town of Windsor |
Random |
To see which regular precincts were combined into consolidated precincts for a particular election, refer to the "Voting Precinct to Regular Precinct Report" and/or "Regular Precinct to Voting Precinct Report" for that election.
Purchasing Maps
Interested in buying a map? Please refer to our Purchase Information page.