Lassen County, California
Lassen County: county in California, United States
About
Lassen County is a county located in the U.S. state of California. As of the 2010 census, the population was 34,895 and a population density of 3 people per km². After 10 years in 2020 county had an estimated population of 30,016 inhabitants. Its county seat is Susanville. The county was created 162 years ago in 1863.
County Snapshot
Lassen County at a glance
Lassen County currently has 1 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
1
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
California counties
58
Open related pagesLargest city
SusanvillePopulation 14,425
Top linked places
Quick Facts about Lassen County
| Population | 30,016 (2020) |
| Country | United States of America |
| State | California (United States) |
| Area | 12226 km2 |
| Water as percent of area | 3.46% |
| Land as percent of area | 96.54% |
| Latitude & Longitude | 40.6736,-120.5943 |
| Named for | Peter Lassen |
| Altitude | 6,680 feet / 2036 meters |
| Capital | Susanville |
| Establishment | January 01, 1864 |
| Time Zone | America/Los_Angeles |
| Local time | 21:50:39 (17th April 2026) |
| Density | 2 Pop. per km² as of 2020 |
| Population growth | -16.25% (2010-2020) |
| Weather | 22℉ Mostly Clear 7-days weather |
Geography
Lassen County is located at 40°40'25"N 120°35'40"W (40.6735900, -120.5943300). It has 4 neighbors: Plumas County, Modoc County, Shasta County and Washoe County.
Lassen County map
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The largest city of Lassen County is Susanville with a population of 14,425. . See all Lassen County cities & populated places.
Lassen County Populated Places
Cities, towns, neighborhoods & other populated places in Lassen County.
| City Name | Population | Title |
|---|---|---|
| Susanville | 14,425 | County seat of Lassen County, California, United States |
Weather
Mostly clear, with a low around 22. Northeast wind 5 to 15 mph, with gusts as high as 30 mph.
7-Day Forecast- Susanville
Demographics
According to census records, the population of Lassen County decreased by 16.25% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 34,895 | - | census |
| 2011 | 34,246 | -1.9% | estimation process |
| 2012 | 33,629 | -1.83% | estimation process |
| 2013 | 32,129 | -4.67% | estimation process |
| 2014 | 31,664 | -1.47% | estimation process |
| 2015 | 31,256 | -1.31% | estimation process |
| 2016 | 30,721 | -1.74% | estimation process |
| 2017 | 30,920 | 0.64% | estimation process |
| 2018 | 30,618 | -0.99% | estimation process |
| 2019 | 30,573 | -0.15% | estimation process |
| 2020 | 30,016 | -1.86% | estimation process |
People born in Lassen County (1)
American actor Claude Johnson was born in Lassen County
California Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Los Angeles County | 9,943,046 | County in California, United States of America |
| Los Angeles | 3,970,219 | The second most populous city in the United States and the center of the Los Angeles metropolitan area. |
| San Diego County | 3,332,427 | Founded in 1850, is one of 58 counties in the US state of California. |
| Orange County | 3,166,857 | County in California, United States |
| Riverside County | 2,489,188 | County in California, United States |
| San Bernardino County | 2,189,183 | County in California, United States |
| Santa Clara County | 1,907,105 | County in California, United States |
| Alameda County | 1,662,323 | County in California, United States |
| Sacramento County | 1,559,146 | County in California, United States |
| San Diego | 1,422,420 | The eighth most populous city in the United States and the center of the San Diego metropolitan area. |
| Laguna | 1,370,232 | A city located in Orange County, California. |
| Contra Costa County | 1,152,333 | County in California, United States |
| San Jose | 1,013,616 | The tenth most populous city in the United States and the center of the San Jose metropolitan area. |
| Fresno County | 1,000,918 | County in California, United States |
| Kern County | 901,362 | This county is located in the southern San Joaquin Valley, extending eastward over the Tehachapi Mountains to the Mojave Desert. |
| San Francisco County | 866,606 | County, coextensive with the city of San Francisco, California, United States |