Mountain House is a census-designated place and planned community in San Joaquin County, California. An exurb of the San Francisco Bay Area, Mountain House is 5 miles (8 km) from the City of Tracy near Interstate 205. The community of Mountain House in San Joaquin County lies two miles (3 km) northeast of and borrows the name of Alameda County’s historical Mountain House, a halfway stop for forty-niners passing over the Altamont Pass (historic Livermore Pass) on their way to the gold country of the Sierra Nevada foothills located at the base of the Diablo Range on the western edge of California’s Central Valley.
In November 2008, the community appeared in nationwide news reports as having the highest percentage of negative equity in the United States – the most homes “under water” (worth less than their mortgage). In 2012, despite a partially outdated land plan and a lack of retail and industrial centers, Mountain House was experiencing economic recovery. In 2010 CDP’s population was 9,675. In 2016, the population was around 14,009.
The 2010 United States Census reported that Mountain House had a population of 9,675. The population density was 3,030.8 people per square mile (1,170.2/km²). The racial makeup was 3,467 (35.8%) White, 903 (9.3%) African American, 45 (0.5%) Native American, 3,830 (39.6%) Asian, 71 (0.7%) Pacific Islander, 663 (6.9%) from other races, and 696 (7.2%) from two or more races. Hispanic or Latino of any race were 1,637 persons (16.9%).
The Census reported that 9,675 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 2,807 households, out of which 1,676 (59.7%) had children under the age of 18 living in them, 1,985 (70.7%) were opposite-sex married couples living together, 227 (8.1%) had a female householder with no husband present, 151 (5.4%) had a male householder with no wife present. There were 186 (6.6%) unmarried opposite-sex partnerships, and 31 (1.1%) same-sex married couples or partnerships. 299 households (10.7%) were made up of individuals and 18 (0.6%) had someone living alone who was 65 years of age or older. The average household size was 3.45. There were 2,363 families(84.2% of all households); the average family size was 3.73.
The population was spread out with 3,351 people (34.6%) under the age of 18, 501 people (5.2%) age 18 to 24, 3,780 people (39.1%) ages 25 to 44, 1,676 people (17.3%) ages 45 to 64, and 367 people (3.8%) who were 65 years of age or older. The median age was 31.4 years. For every 100 females, there were 98.9 males. For every 100 females age 18 and over, there were 94.2 males.
There were 3,237 housing units at an average density of 1,014.0 per square mile (391.5/km²), of which 2,205 (78.6%) were owner-occupied, and 602 (21.4%) were occupied by renters. The homeowner vacancy rate was 4.9%; the rental vacancy rate was 5.6%. 7,444 people (76.9% of the population) lived in owner-occupied housing units and 2,231 people (23.1%) lived in rental housing units.