Williams, California Zip Codes
📍 Williams is in Colusa County, California with 1 zip code; the most populous is 95987.
Williams is a USPS city name in Colusa County, California with a Census population of approximately 6,504 across its ZIP codes. Colusa County as a whole has 8 ZIP codes in this directory. Below you'll find every zip code serving Williams with population, income and home value, a map, and the city's affordability profile.
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 Williams Zip Codes
Williams at a Glance
Williams has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 6,504 residents, the largest being 95987 with 6,504 people.
The median ZIP in Williams has a household income of $82,935 and a home value of $359,600, a price-to-income ratio of 4.3, below the 6.7 California ZIP median. Median rent across these ZIPs is $1,202 a month.
57% of households in the typical Williams 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 6.2%, below the 10.8% statewide ZIP median. Overall density is about 21 residents per square mile across 317 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.
Williams Zip Code Map
Interactive map of Williams, California zip codes. Click any marker for details.