Castro Valley, California | |
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![]() Castro Valley, c. 1970 | |
![]() Location of Castro Valley within Alameda County, California | |
Coordinates: 37°41′39″N 122°05′11″W / 37.69417°N 122.08639°W[1] | |
Country | ![]() |
State | ![]() |
County | Alameda |
Area | |
• Total | 17.07 sq mi (44.21 km2) |
• Land | 16.85 sq mi (43.64 km2) |
• Water | 0.22 sq mi (0.57 km2) 1.68% |
Elevation | 161 ft (49 m) |
Population | |
• Total | 66,441 |
• Density | 3,943.55/sq mi (1,522.58/km2) |
Time zone | UTC-8 (PST) |
• Summer (DST) | UTC-7 (PDT) |
ZIP codes | 94546, 94552, 94578, 94541, 94542 |
Area code(s) | 510, 341 |
FIPS code | 06-11964 |
GNIS feature IDs | 1658237, 2407987 |
Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. As of the 2020 census, it is the fourth most populous unincorporated area in California. The population was 66,441 at the 2020 census.[4]