Sierra County, CA ZIP codes
There are 8 ZIP codes in Sierra County, CA, in 8 towns, from 95910 to 96126. The largest are 96118 (Loyalton), 95960 (North San Juan) and 96124 (Calpine). 1 more crosses into it from a neighbouring county: 96105.
The county seat is Downieville.
- ZIP codes
- 8
- Partly in it
- 1 more
- Towns
- 8
- County seat
- Downieville
- County FIPS
06091- State
- California
- Population
- 2,746
- Median household income
- $63,355
- Land area
- 953 sq mi
Sierra County ZIP codes by town
- Downieville (county seat)
- 95936
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
ZIP codes partly in Sierra County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Sierra County.
- 96105 Chilcoot · mostly in Plumas County
Map of Sierra County ZIP codes
The ZIP codes of Sierra County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Sierra County in numbers
About 2,746 people live in Sierra County, in 1,219 households, the 57th most populous of California's 58 counties. The median household income is $63,355 a year, 36% below the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $331,900 (55% below the California median). The median age is 54.7; 25.8% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 24 minutes.
| Population | 2,746 |
|---|---|
| Households | 1,219 |
| Median age | 54.7 |
| Median household income | $63,355 |
| Median home value | $331,900 |
| Bachelor's degree or higher | 25.8% |
| Mean commute | 24.3 min |
| Population density | 3 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Sierra County
| Town | ZIP codes | Population |
|---|---|---|
| Loyalton | 1 | 748 |
| Calpine | 1 | 356 |
| Sierraville | 1 | 351 |
| Sierra City | 1 | 250 |
| North San Juan | 1 | 179 |
| Downieville | 1 | 126 |
| Goodyears Bar | 1 | 122 |
| Alleghany | 1 | 19 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Sierra County.
Not sure you are in Sierra County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Sierra County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
95910 | Alleghany , CA | Standard | 19 | — | — |
95936 | Downieville , CA | Standard | 144 | — | — |
95944 | Goodyears Bar , CA | Standard | 122 | — | — |
95960 | North San Juan , CA | Standard | 540 | $52,917 | $460,400 |
96118 | Loyalton , CA | Standard | 1,328 | $54,167 | $243,800 |
96124 | Calpine , CA | Standard | 387 | $205,893 | $467,900 |
96125 | Sierra City , CA | Standard | 263 | $95,554 | $378,200 |
96126 | Sierraville , CA | Standard | 351 | — | — |
Cite this page
zipcodes.pro. “Sierra County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ca/county/sierra
Underlying data is public domain or openly licensed — sources, vintages and licences.