Okemos, Michigan, United States [CDP]; population was 20,216 in 1990; housing units was 7,961 in 1990; location is 42°42'N 84°25'W; land area is 17.30 square miles (11,075 acres); water area is 0.03 square miles (16 acres); FIPS code is 60340 [SourceCBP]