| ZIP Codes: | 15 ZIP Codes (10 Standard, 5 PO Box, 0 Unique) [See All] |
| Area Code: | 530 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:28 PM |
| Population: | 31,027 [See All] |
| FIPS: | 06035 |
| CBSA: | Susanville, CA |
| Land Area: | 3,460 sq mi |
| Water Area: | 62 sq mi |
| Coordinates: | 40.5404, -120.5121 |
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31,027 residents live across 15 ZIPs covering 3,460 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 33,926 to 31,027 from 2014 to 2024 — a -8.5% change. 3 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 96117 (Litchfield, $104,583 median) and poorest ZIP 96109 (Doyle, $43,988) are 35.4 miles apart — a 2.4× income gap across local geography.
Median home values vary 5.6× across this county — from $73,900 in 96113 (Herlong) to $414,900 in 96137 (Westwood).
Density varies 109× across the county — from 1 people/sq mi in 96117 (Litchfield) to 87 in 96113 (Herlong).
Educational attainment ranges from 3.9% bachelor's+ in 96113 (Herlong) to 27.4% in 96009 (Bieber) — the breadth of educational profiles across the area.
Within California, this is the #47 most populous of 58 counties and ranks #42 for median household income .
Weighted by population, the typical household earns about $71,489 across the county — reflecting what a typical resident sees, not a simple ZIP average.
13.9% of adults age 25+ hold a bachelor's degree or higher (3,228 of 23,166 reporting).
10 Standard delivery, 5 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Lassen County lost 8.5% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 96130 | Susanville | Standard | 20,173 | $72,465 | 955.1 | -8.0% |
| 96114 | Janesville | Standard | 2,959 | $79,688 | 115.2 | -10.7% |
| 96137 | Westwood | Standard | 2,923 | $65,896 | 133.8 | -18.9% |
| 96113 | Herlong | PO Box | 2,039 | $67,083 | 23.3 | -11.1% |
| 96109 | Doyle | Standard | 1,299 | $43,988 | 418.5 | 77.7% |
| 96128 | Standish | Standard | 656 | $91,012 | 17.9 | -13.5% |
| 96009 | Bieber | PO Box | 307 | — | 174.6 | -6.7% |
| 96117 | Litchfield | Standard | 261 | $104,583 | 324.4 | 7.0% |
| 96121 | Milford | Standard | 217 | $58,021 | 86.8 | -12.9% |
| 96068 | Nubieber | PO Box | 94 | — | 10.1 | -30.4% |
| 96123 | Ravendale | Standard | 45 | $41,563 | 494.7 | 25.0% |
| 96136 | Wendel | Standard | 27 | — | 262.4 | -80.0% |
| 96132 | Termo | Standard | 21 | $68,472 | 349.0 | -79.6% |
| 96119 | Madeline | PO Box | 6 | — | 94.6 | -91.5% |
| 96127 | Susanville | PO Box | — | — | 0.0 | — |