Petrolia, California Zip Codes
📍 Petrolia is in Humboldt County, California with 1 zip code; the most populous is 95558.
Petrolia is a USPS city name in Humboldt County, California with a Census population of approximately 246 across its ZIP codes. Humboldt County as a whole has 38 ZIP codes in this directory. Below you'll find every zip code serving Petrolia 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 Petrolia Zip Codes
Petrolia at a Glance
Petrolia has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 246 residents, the largest being 95558 with 246 people.
The median ZIP in Petrolia has a household income of $42,917 and a home value of $1,041,700, a price-to-income ratio of 24.3, far above the 6.7 California ZIP median.
69% of households in the typical Petrolia ZIP own their home (statewide ZIP median 64%). 25% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 27.6%, far above the 10.8% statewide ZIP median. Overall density is about 1 residents per square mile across 168 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.
Petrolia Zip Code Map
Interactive map of Petrolia, California zip codes. Click any marker for details.