Merrillville, Indiana, United States [Town]; population was 27,257 in 1990; housing units was 10,322 in 1990; location is 41°28'N 87°20'W; land area is 31.02 square miles (19,852 acres); water area is 0.03 square miles (19 acres); FIPS code is 48528 [SourceCBP]