Richmond Highlands, Washington, United States [CDP]; population was 26,037 in 1990; housing units was 10,648 in 1990; location is 47°46'N 122°21'W; land area is 5.10 square miles (3,261 acres); water area is 0.01 square miles (9 acres); FIPS code is 58340 [SourceCBP]