Janesville, California Zip Codes
📍 Janesville is in Lassen County, California with 1 zip code; the most populous is 96114.
Janesville is a USPS city name in Lassen County, California with a Census population of approximately 2,927 across its ZIP codes. Lassen County as a whole has 17 ZIP codes in this directory. Below you'll find every zip code serving Janesville 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 Janesville Zip Codes
Janesville at a Glance
Janesville has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 2,927 residents, the largest being 96114 with 2,927 people.
The median ZIP in Janesville has a household income of $63,984 and a home value of $293,300, a price-to-income ratio of 4.6, below the 6.7 California ZIP median. Median rent across these ZIPs is $1,353 a month.
73% of households in the typical Janesville ZIP own their home (statewide ZIP median 64%). 13% of adults hold a bachelor's degree, far below the 31% statewide median. The median poverty rate is 6.9%, below the 10.8% statewide ZIP median. Overall density is about 45 residents per square mile across 66 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.
Janesville Zip Code Map
Interactive map of Janesville, California zip codes. Click any marker for details.