Onyx, California Zip Codes
📍 Onyx is in Kern County, California with 1 zip code; the most populous is 93255.
Onyx is a USPS city name in Kern County, California with a Census population of approximately 872 across its ZIP codes. Kern County as a whole has 65 ZIP codes in this directory. Below you'll find every zip code serving Onyx 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 Onyx Zip Codes
Onyx at a Glance
Onyx has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 872 residents, the largest being 93255 with 872 people.
The median ZIP in Onyx has a household income of $29,974 and a home value of $134,000, a price-to-income ratio of 4.5, below the 6.7 California ZIP median.
89% of households in the typical Onyx ZIP own their home (statewide ZIP median 64%). 18% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 20.5%, far above the 10.8% statewide ZIP median. Overall density is about 4 residents per square mile across 238 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.
Onyx Zip Code Map
Interactive map of Onyx, California zip codes. Click any marker for details.