|Lake County and the state of California|
|Total||2.891 sq mi (7.487 km2)|
|Land||2.885 sq mi (7.472 km2)|
|Water||0.006 sq mi (0.015 km2) 0.20%|
|Elevation||1,384 ft (422 m)|
|Density||1,200/sq mi (450/km2)|
|Time zone||Pacific (PST) (UTC-8)|
|Summer (DST)||PDT (UTC-7)|
|GNIS feature ID||0277532|
Kelseyville (formerly, Kelsey, Kelsey Creek, Kelsey Town, Peartown, and Uncle Sam) is a census-designated place (CDP) in Lake County, California, United States. Kelseyville is located 6 miles (9.7 km) southeast of Lakeport, at an elevation of 1384 feet (422 m). The population was 3,353 at the 2010 census, up from 2,928 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 2.9 square miles (7.5 km2), over 99% of it land.
The place was originally called Kelsey Town in honor of Andrew Kelsey, the first American settler in Lake County. He was killed in 1850 in an uprising against him by a band of Pomo enslaved by Kelsey. This episode ended with the Bloody Island Massacre. The first blacksmith's opened in 1857. The place was called Uncle Sam after Mount Uncle Sam (now Mount Konocti). The Uncle Sam post office opened in 1858 and changed its name to Kelseyville in 1882.
The 2010 United States Census reported that Kelseyville had a population of 3,353. The population density was 1,159.9 people per square mile (447.8/km ). The racial makeup of Kelseyville was 2,213 (66.0%) White, 22 (0.7%) African American, 51 (1.5%) Native American, 32 (1.0%) Asian, 2 (0.1%) Pacific Islander, 888 (26.5%) from other races, and 145 (4.3%) from two or more races. Hispanic or Latino of any race were 1,337 persons (39.9%).
The Census reported that 3,349 people (99.9% of the population) lived in households, 4 (0.1%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 1,224 households, out of which 438 (35.8%) had children under the age of 18 living in them, 574 (46.9%) were opposite-sex married couples living together, 173 (14.1%) had a female householder with no husband present, 75 (6.1%) had a male householder with no wife present. There were 80 (6.5%) unmarried opposite-sex partnerships, and 13 (1.1%) same-sex married couples or partnerships. 323 households (26.4%) were made up of individuals and 163 (13.3%) had someone living alone who was 65 years of age or older. The average household size was 2.74. There were 822 families (67.2% of all households); the average family size was 3.31.
The population was spread out with 883 people (26.3%) under the age of 18, 298 people (8.9%) aged 18 to 24, 783 people (23.4%) aged 25 to 44, 912 people (27.2%) aged 45 to 64, and 477 people (14.2%) who were 65 years of age or older. The median age was 38.0 years. For every 100 females there were 101.3 males. For every 100 females age 18 and over, there were 98.2 males.
There were 1,329 housing units at an average density of 459.7 per square mile (177.5/km ), of which 785 (64.1%) were owner-occupied, and 439 (35.9%) were occupied by renters. The homeowner vacancy rate was 1.7%; the rental vacancy rate was 7.0%. 1,992 people (59.4% of the population) lived in owner-occupied housing units and 1,357 people (40.5%) lived in rental housing units.
As of the census of 2000, there were 2,928 people, 1,095 households, and 724 families residing in the CDP. The population density was 905.5 people per square mile (350.0/km ). There were 1,175 housing units at an average density of 363.4 per square mile (140.5/km ). The racial makeup of the CDP was 76.98% White, 0.14% Black or African American, 2.66% Native American, 0.89% Asian, 14.58% from other races, and 4.75% from two or more races. 28.76% of the population were Hispanic or Latino of any race.
There were 1,095 households out of which 33.7% had children under the age of 18 living with them, 46.9% were married couples living together, 14.8% had a female householder with no husband present, and 33.8% were non-families. 27.6% of all households were made up of individuals and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.24.
In the CDP the population was spread out with 28.4% under the age of 18, 7.5% from 18 to 24, 26.7% from 25 to 44, 20.6% from 45 to 64, and 16.8% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.0 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the CDP was $24,363, and the median income for a family was $28,958. Males had a median income of $26,758 versus $20,036 for females. The per capita income for the CDP was $15,651. About 12.8% of families and 15.3% of the population were below the poverty line, including 17.7% of those under age 18 and 11.1% of those age 65 or over.
Charles Stone and Andy Kelsey built a home in the 19th-century at Main St. and Bell Hill Rd. They bought the property from Salvador Vallejo. Local American Indians were enslaved to build the home. In fall, 1849, the Indians revolted and killed Stone and Kelsey. They are buried at the former site of the home. It is a California Historical Landmark, #426.