zip code 91381, it was developed as part of Valencia. The two subdivisions are connected by The Old Road. Both subdivisions are located west of Interstate 5. The Valencia neighborhood of the city of Santa Clarita lies to the east and northeast, Newhall lies to the southeast, and unincorporated Valencia lies to the north. Government and infrastructure The Los Angeles County Sheriff's Department (LASD) operates the Santa Clarita Valley Station in Santa Clarita, serving Stevenson Ranch for law enforcement. Traffic enforcement is handled by the California Highway Patrol (CHP). The city of Santa Clarita has tried unsuccessfully to annex Stevenson Ranch. Demographics The 2010 United States Census reported that Stevenson Ranch had a population of 17,557. The population density was . The racial makeup of Stevenson Ranch was 11,271 (64.2%) White (53.9% Non-Hispanic White), 606 (3.5%) African American, 65 (0.4%) Native American, 4,028 (22.9%) Asian, 34 (0.2%) Pacific Islander, 765 (4.4%) from other races, and 788 (4.5%) from two or more races. Hispanic or Latino of any race were 2,827 persons (16.1%). The Census reported that 17,557 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized. There were 5,663 households, out of which 3,006 (53.1%) had children under the age of 18 living in them, 3,761 (66.4%) were opposite-sex married couples living together, 533 (9.4%) had a female householder with no husband present, 231 (4.1%) had a male householder with no wife present. There were 251 (4.4%) unmarried opposite-sex partnerships, and 42 (0.7%) same-sex married couples or partnerships. Of the households, 828 (14.6%) were made up of individuals, and 227 (4.0%) had someone living alone who was 65 years of age or older. The average household size was 3.10. There were 4,525 families (79.9% of all households); the average family size was 3.48. The population was spread out, with 5,659 people (32.2%) under the age of 18, 1,261 people (7.2%) aged 18 to 24, 4,871 people (27.7%) aged 25 to 44, 4,668 people (26.6%) aged 45 to 64, and 1,098 people (6.3%) who were 65 years of age or older. The median age was 36.5 years. For every 100 females, there were 95.2 males. For every 100 females age 18 and over, there were 91.0 males. There were 5,842 housing units at an average density of , of which 4,171 (73.7%) were owner-occupied, and 1,492 (26.3%) were occupied by