Castaic Dam (photographed October 7, 2007)
Location within Los Angeles county
|• Total||7.278 sq mi (18.851 km2)|
|• Land||7.261 sq mi (18.806 km2)|
|• Water||0.017 sq mi (0.045 km2) 0.24%|
|Elevation||1,280 ft (390 m)|
|• Density||2,600/sq mi (1,000/km2)|
|Time zone||Pacific (PST) (UTC-8)|
|• Summer (DST)||PDT (UTC-7)|
|ZIP codes||91384, 91310|
|GNIS feature ID||2582966|
|U.S. Geological Survey Geographic Names Information System: Castaic, California|
Castaic, California, is a rural unincorporated community located in the northern part of Los Angeles County, California. Many thousands of motorists pass through Castaic daily as they drive to or from Los Angeles on Interstate 5. Castaic Lake is part of the California Water Project and is the site of a hydro-electric power plant. Castaic is located approximately 40 miles (64 km) northwest of the downtown Los Angeles Civic Center and about 10 miles (16 km) north of the community of Santa Clarita, California.
The origin of the name Castaic is the Chumash Native American word Kashtek, meaning "eyes." Modern Castaic began in 1915 with the opening of the original Ridge Route, which brought travelers looking for gasoline, water, food and lodging to the community. Some of the earliest businesses started in Castaic are Castaic Brick (founded 1927) and George Dunn's Wayside Dairy (founded 1929). Sam's Place (Sam Parson, proprietor) on the Ridge Route has long since gone and is now a memory. Castaic is a major truck stop along the Interstate 5 freeway.
Castaic covers 7.3 square miles (18.9 km2) of area and includes the Val Verde and Chiquito Canyon areas. Castaic Lake is the southern terminus of the west branch of the California Water Project. A 1,175-megawatt pumped-storage hydroelectric plant at the north end of Castaic Lake captures the energy from the falling water descending toward the Los Angeles area.
This region experiences warm and dry summers, with no average monthly temperatures above 71.6 °F. Although, during the months of June though September, the average high temperature ranges from the 90s to above 100 °F. According to the Köppen Climate Classification system, Castaic has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.
The 2010 United States Census reported that Castaic had a population of 19,015. The population density was 2,612.5 people per square mile (1,008.7/km²). The racial makeup of Castaic was 13,607 (71.6%) White (57.1% Non-Hispanic White), 630 (3.3%) African American, 119 (0.6%) Native American, 2,162 (11.4%) Asian, 26 (0.1%) Pacific Islander, 1,466 (7.7%) from other races, and 1,005 (5.3%) from two or more races. Hispanic or Latino of any race were 4,716 persons (24.8%).
The Census reported that 18,946 people (99.6% of the population) lived in households, 69 (0.4%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized. This statistic, however, does not include the population of the North County Correctional Facility, a Los Angeles County Jail with a population of 3,800 fully institutionalized inmates.
There were 5,751 households, out of which 3,047 (53.0%) had children under the age of 18 living in them, 3,943 (68.6%) were opposite-sex married couples living together, 582 (10.1%) had a female householder with no husband present, 313 (5.4%) had a male householder with no wife present. There were 276 (4.8%) unmarried opposite-sex partnerships, and 41 (0.7%) same-sex married couples or partnerships. 650 households (11.3%) were made up of individuals and 170 (3.0%) had someone living alone who was 65 years of age or older. The average household size was 3.29. There were 4,838 families (84.1% of all households); the average family size was 3.57.
The population was spread out with 5,761 people (30.3%) under the age of 18, 1,717 people (9.0%) aged 18 to 24, 5,144 people (27.1%) aged 25 to 44, 5,302 people (27.9%) aged 45 to 64, and 1,091 people (5.7%) who were 65 years of age or older. The median age was 35.6 years. For every 100 females there were 101.2 males. For every 100 females age 18 and over, there were 99.8 males.
There were 5,932 housing units at an average density of 815.0 per square mile (314.7/km²), of which 4,843 (84.2%) were owner-occupied, and 908 (15.8%) were occupied by renters. The homeowner vacancy rate was 1.2%; the rental vacancy rate was 6.7%. 16,231 people (85.4% of the population) lived in owner-occupied housing units and 2,715 people (14.3%) lived in rental housing units.
According to the 2010 United States Census, Castaic had a median household income of $103,811, with 8.6% of the population living below the federal poverty line.
Government and infrastructure
The Castaic Union School District consists of four schools: three elementary schools and one middle school. Live Oak Elementary School, Castaic Elementary School and Northlake Hills Elementary School serve students in kindergarten through fifth grades. Castaic Middle School serves grades six through eight. The school district does not yet have a high school. Currently, Castaic high school students attend either Valencia High School or West Ranch High School in the William S. Hart Union High School District.
On January 3, 2013, a pair of earthquakes of magnitude 3.1 (location: , depth=9.0 km (5.6 mi)) and 4.2 (location: , depth=8.9 km (5.5 mi)) were reported about 14 kilometres (8.7 mi) north of Castaic. The epicenter was 16 miles (26 km) from Santa Clarita, California. 
- U.S. Census
- U.S. Geological Survey Geographic Names Information System: Castaic, California
- Climate Summary for Castaic, California
- "American FactFinder". United States Census Bureau. Retrieved December 11, 2013.
- "2010 Census Interactive Population Search: CA - Castaic CDP". U.S. Census Bureau. Retrieved July 12, 2014.
-  "Community Facts" American FactFinder, United States Census Bureau
- "Santa Clarita Valley Station." Los Angeles County Sheriff's Department. Retrieved on January 21, 2010.
- Hamilton, Matt (January 3, 2015). "Earthquake: 4.2 and 3.0 temblors recorded near Castaic". Los Angeles Times. Retrieved January 4, 2015.
- "M3.1 - 13km N of Castaic, California 2014-12-31 06:27:41 UTC". United States Geological Survey. Retrieved January 4, 2015.
- "M4.2 - 14km N of Castaic, California 2015-01-04 03:18:09 UTC". United States Geological Survey. Retrieved January 4, 2015.
- "History of Castaic". Santa Clarita Valley Historical Society. Retrieved 2004-07-04.