Sierra County, California Zip Codes
📍 Sierra County has 8 zip codes with a population of 3,290.
Sierra County is located in California with a land area of 473 square miles. The county seat is Loyalton. Below you'll find all 8 zip codes in Sierra County with population, income and home value, the county's affordability profile, and links to its 8 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 Sierra County Zip Codes
| ZIP Code | City | Details |
|---|---|---|
| 95910 | Alleghany | View → |
| 95936 | Downieville | View → |
| 95944 | Goodyears Bar | View → |
| 95960 | North San Juan | View → |
| 96118 | Loyalton | View → |
| 96124 | Calpine | View → |
| 96125 | Sierra City | View → |
| 96126 | Sierraville | View → |
Sierra County at a Glance
Sierra County has 8 ZIP codes in this directory: 8 standard delivery ZIPs. The 5 ZIPs with published Census housing data cover 3,290 residents, the largest being 96118 (Loyalton) with 1,581 people.
The median ZIP in Sierra County has a household income of $74,917 and a home value of $367,900, a price-to-income ratio of 5.1, below the 6.7 California ZIP median. Affordability ranges from 96124 in Calpine at a ratio of 3.9 to 95936 in Downieville, where the median home is $1,048,100. The highest median income is in 95936 (Downieville) at $106,058. Median rent across these ZIPs is $900 a month.
85% of households in the typical Sierra County 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 20.7%, far above the 10.8% statewide ZIP median. Overall density is about 7 residents per square mile across 473 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.
Sierra County Zip Code Map
Interactive map of Sierra County, California zip codes.