Orinda, California, United States [City]; population was 16,642 in 1990; housing units was 6,475 in 1990; location is 37°53'N 122°11'W; land area is 12.59 square miles (8,057 acres); water area is 0.04 square miles (23 acres); FIPS code is 54232 [SourceCBP]