| Official Name: | Sierraville |
| Settlement Type: | census-designated place |
| Pushpin Map: | California#USA |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Sierra |
| Unit Pref: | US |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 5.021 |
| Area Land Sq Mi: | 5.020 |
| Area Water Sq Mi: | 0.001 |
| Area Total Km2: | 13.004 |
| Area Land Km2: | 13.002 |
| Area Water Km2: | 0.002 |
| Area Water Percent: | 0.02 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 239 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 4957 |
| Coordinates: | 39.5897°N -120.3675°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 96126 |
| Area Code: | 530 |
| Blank Name: | GNIS feature IDs |
| Blank Info: | 1660231; 2583141 |
Sierraville (Sierra, Spanish for "mountain range" and Ville, French for "town") is a census-designated place in Sierra County, California, United States. It is at the southern end of the huge Sierra Valley which is used primarily as pasture and is also at the junction of California State Route 49 and California State Route 89 southwest of Loyalton. Sierraville has a post office with ZIP code 96126.[3] The post office opened under the name Sierra Valley in 1862 and became known as the Sierraville post office in 1899.[4] The population was 200 as of the 2010 census.
It is the site of the only traffic signal (a flashing red light) in Sierra County. In the winter of 2007, it was removed after an automobile accident and was replaced in the fall of 2008.
According to the United States Census Bureau, the CDP covers an area of 5.0 square miles (13.0 km), 99.98% of it land and 0.02% of it water.
This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, Sierraville has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.[5]
The 2010 United States Census[6] reported that Sierraville had a population of 200. The population density was 39.8sp=usNaNsp=us. The racial makeup of Sierraville was 187 (93.5%) White, 2 (1.0%) African American, 0 (0.0%) Native American, 0 (0.0%) Asian, 0 (0.0%) Pacific Islander, 10 (5.0%) from other races, and 1 (0.5%) from two or more races. Hispanic or Latino of any race were 16 persons (8.0%).
The Census reported that 200 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 95 households, out of which 13 (13.7%) had children under the age of 18 living in them, 50 (52.6%) were opposite-sex married couples living together, 5 (5.3%) had a female householder with no husband present, 4 (4.2%) had a male householder with no wife present. There were 9 (9.5%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 26 households (27.4%) were made up of individuals, and 7 (7.4%) had someone living alone who was 65 years of age or older. The average household size was 2.11. There were 59 families (62.1% of all households); the average family size was 2.51.
The population was spread out, with 21 people (10.5%) under the age of 18, 12 people (6.0%) aged 18 to 24, 33 people (16.5%) aged 25 to 44, 89 people (44.5%) aged 45 to 64, and 45 people (22.5%) who were 65 years of age or older. The median age was 52.6 years. For every 100 females, there were 117.4 males. For every 100 females age 18 and over, there were 113.1 males.
There were 136 housing units at an average density of 27.1sp=usNaNsp=us, of which 68 (71.6%) were owner-occupied, and 27 (28.4%) were occupied by renters. The homeowner vacancy rate was 1.4%; the rental vacancy rate was 12.9%. 144 people (72.0% of the population) lived in owner-occupied housing units and 56 people (28.0%) lived in rental housing units.
In the state legislature, Sierraville is included in,[7] and .[8]
Federally, Sierraville is in .[9]