94931 ZIP Code Profile, Map, Data & Demographics

Related Place Profiles:
Cotati, CA

ZIP Code 94931: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Cotati, CA 94931

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  • ZIP Code Type: STANDARD
  • County: Sonoma County
  • Centroid: Latitude 38.326, Longitude -122.705
  • Time Zone: Pacific Time Zone (UTC -8 hours)
  • Observes DST: Yes
  • Businesses Addresses: 626
  • PO Box Addresses: 617
  • Residential Addresses: 3,668
    • Multi-Family Addresses: 478
    • Single Family Addresses: 3,190

The ZIP Code maps and database are updated 4 times per year.
Database updated: July 1, 2021, Maps updated: May 5, 2021.


Cotati, CA 94931 Data & Demographics (As of July 1, 2021)


Total Population 9,210 (100%)
Population in Households 9,176 (99.6%)
Population in Families 6,685 (72.6%)
Population in Group Quarters1 34 ( 0.4%)
Population Density 1,264
Diversity Index2 60


Median Household Income $79,219
Average Household Income $105,944
% of Income for Mortgage4 34%
Per Capita Income $43,212
Wealth Index5 109


Total HU (Housing Units) 3,937 (100%)
Owner Occupied HU 2,327 (59.1%)
Renter Occupied HU 1,429 (36.3%)
Vacant Housing Units 181 ( 4.6%)
Median Home Value $642,273
Average Home Value $689,267
Housing Affordability Index3 77


Total Households 3,756
Average Household Size 2.44
Family Households 2,231
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 0.13% -0.01%
Households 0.1% -0.05%
Families 0.09% -0.04%
Median Household Income   1.72%
Per Capita Income   2.64%
Owner Occupied HU   0.09%

Cotati, CA 94931 - Peer Comparisons by Rank and Percentile

The table below compares 94931 to the other 1,770 ZIP Codes in California by rank and percentile using July 1, 2021 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 1027 42nd
Population Density # 793 55th
Median Household Income # 718 59th
Housing Affordability Index # 819 46th
Per Capita Income # 586 67th
Diversity Index # 1134 36th

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.

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