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Castro Valley

1. Castro Valley, California, United States [CDP]; population was 48,619 in 1990; housing units was 19,682 in 1990; location is 37°43'N 122°4'W; land area is 13.26 square miles (8,486 acres); water area is 0.10 square miles (66 acres); FIPS code is 11964 [SourceCBP]
2. Castro Valley, California, United States [Populated Place] is in Alameda County; location is 37°41'39"N 122°5'7"W [SourceGSP]
3. Hayward, California, United States Postal Service Zip Code is 94546 (Castro Valley) [SourcePSZ]