Colusa County, California Zip Codes
📍 Colusa County has 8 zip codes with a population of 21,896.
Colusa County is located in California with a land area of 1,062 square miles. The county seat is Colusa. Below you'll find all 8 zip codes in Colusa County with population, income and home value, the county's affordability profile, and links to its 7 city pages.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Colusa County Zip Codes
| ZIP Code | City | Details |
|---|---|---|
| 95912 | Arbuckle | View → |
| 95931 | College City | View → |
| 95932 | Colusa | View → |
| 95950 | Grimes | View → |
| 95955 | Maxwell | View → |
| 95970 | Princeton | View → |
| 95979 | Stonyford | View → |
| 95987 | Williams | View → |
Colusa County at a Glance
Colusa County has 8 ZIP codes in this directory: 7 standard delivery ZIPs and 1 PO Box or unique ZIP that carries no resident population in Census data. The 6 ZIPs with published Census housing data cover 21,896 residents, the largest being 95932 (Colusa) with 7,789 people.
The median ZIP in Colusa County has a household income of $70,199 and a home value of $354,500, a price-to-income ratio of 5.6, below the 6.7 California ZIP median. Affordability ranges from 95987 in Williams at a ratio of 4.3 to 95970 in Princeton, where the median home is $458,300. The highest median income is in 95987 (Williams) at $82,935. Median rent across these ZIPs is $1,081 a month.
67% of households in the typical Colusa County ZIP own their home (statewide ZIP median 64%). 15% of adults hold a bachelor's degree, far below the 31% statewide median. The median poverty rate is 17.1%, far above the 10.8% statewide ZIP median. Overall density is about 21 residents per square mile across 1,062 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Colusa County Zip Code Map
Interactive map of Colusa County, California zip codes.