Mountain House, California is located in San Joaquin County. Below is a market update video for San Joaquin County. For detailed market report of your neighborhood, please contact us. 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.