Castro Valley, California

Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. At the 2010 census, it was the fifth most populous unincorporated area in California. The population was 66,441 at the 2020 census.

Castro Valley, California
Castro Valley, 2022
Location of Castro Valley within Alameda County, California
Castro Valley, California
Location in the United States
Coordinates: 37°41′39″N 122°05′11″W
Country United States
State California
CountyAlameda
Government
  State SenateNancy Skinner (D)
  State AssemblyLiz Ortega (D)
  U. S. CongressEric Swalwell (D)
Area
  Total17.07 sq mi (44.21 km2)
  Land16.85 sq mi (43.64 km2)
  Water0.22 sq mi (0.57 km2)  1.68%
Elevation
161 ft (49 m)
Population
 (2020)
  Total66,441
  Density3,943.55/sq mi (1,522.58/km2)
Time zoneUTC-8 (PST)
  Summer (DST)UTC-7 (PDT)
ZIP codes
94546, 94552, 94541,
Area code(s)510, 341
FIPS code06-11964
GNIS feature IDs1658237, 2407987

Castro Valley is named after Don Guillermo Castro, a noted 19th-century Californio ranchero who owned the land where the community is located.

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