Residential delivery area · California
ZIP Code 94931: Cotati, CA
ZIP code 94931 uses the postal name Cotati, California and lies entirely in Sonoma County (Census 2020 ZIP-county file). About 9,500 people live there (Census Bureau, ACS 2020-2024). Median household income is $101,994 (Census Bureau, ACS 2020-2024). By Census place, 24% of its land lies in Cotati, and 1% in smaller places; 75% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Cotati · its only residential ZIP
- County
- Sonoma County
- Census places
- Cotati
- Metro area
- Santa Rosa-Petaluma, CA
- House districts
- CA-4 (81%), CA-2 (19%) 119th Congress, by share of land
- State
- California
- Time zone
- Pacific
- Land area
- 7.7 sq mi · 1,227 people per sq mi
Where is ZIP code 94931?
94931 centers on 38.325°, -122.717° and covers 7.7 square miles of land plus 0.0 of water. It borders 5 ZIP codes: 94928, 94951, 95407, 94952, 95472.
The map draws ZIP code areas only. For the streets inside 94931, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 94931 compare with the rest of Sonoma County?
| Measure | 94931 | In Sonoma County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 9,487 | 15th of 40 | 1,015th of 1,802 |
| Median household income | $102k | 16th of 22 | 561st of 1,189 |
| Median home value | $820k | 14th of 26 | 537th of 1,317 |
Its median household income is higher than in 82% of U.S. residential ZIP codes, and it is denser than 80% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 94931?
The 2020 Census counted 9,119 people in 94931; the ACS, which samples households over 2020-2024, estimates 9,487. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 9,487
- 2020 Census count
- 9,119
- Households
- 4,072
- Median age
- 39.2
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 94931?
Of the 9,487 people the ACS estimates in 94931, 15.6% are under 18 and 18.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (65.4%), then Hispanic or Latino (24.1%).
- Under 1815.6%
- 18 to 6466.2%
- 65 and older18.2%
- White, not Hispanic65.4%
- Hispanic or Latino24.1%
- Other or two or more7.3%
- Asian, not Hispanic2.2%
- Black, not Hispanic0.9%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 94931 earn?
Median household income is $101,994 (ACS 2020-2024), the 16th highest of the 22 ranked ZIP codes in Sonoma County.
- Median household income
- $101,994±$21,080
- Income per person
- $55,275
- Below the poverty line
- 8.6%
- Unemployed (of the labor force)
- 3.4%
- Adults 25+ with a bachelor's degree
- 36.1%
- Adjusted gross income per tax return, 2022
- $96,0264,780 returns; wages 68% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 94931?
FHFA's house price index for 94931, built from repeat sales and appraisals of the same homes, rose 67% from 2015 to 2025 and rose 26% from 2020 to 2025, and moved −1.1% in 2025.
- Median home value (owners' estimate)
- $820,000
- Median gross rent
- $1,913
- Homes owned by their occupants
- 59.2%
- Housing units
- 4,134
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 94931?
324 business establishments had a location in this ZIP code in 2023, 4 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction76
- Accommodation and food services44
- Retail trade42
- Other services (except public administration)31
- Professional, scientific, and technical services27
- Health care and social assistance17
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 94931?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94928 | Rohnert Park | 46,829 | $99k | 1.9 mi |
| 94951 | Penngrove | 3,294 | $106k | 3.9 mi |
| 95407 | Santa Rosa | 42,036 | $83k | 5.1 mi |
| 94952 | Petaluma | 33,785 | $117k | 6.7 mi |
| 95472 | Sebastopol | 28,747 | $109k | 9.4 mi |
| 95405 | Santa Rosa | 22,744 | $118k | 8.2 mi (near) |
| 95401 | Santa Rosa | 36,861 | $94k | 9.5 mi (near) |
| 94954 | Petaluma | 37,574 | $114k | 10.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.