Birch Bay, Washington, United States [CDP]; population was 2,656 in 1990; housing units was 2,681 in 1990; location is 48°55'N 122°45'W; land area is 15.99 square miles (10,236 acres); water area is 5.40 square miles (3,458 acres); FIPS code is 6190 [SourceCBP]