Plainwell, Michigan, United States [City]; population was 4,057 in 1990; housing units was 1,541 in 1990; location is 42°27'N 85°39'W; land area is 2.07 square miles (1,328 acres); water area is 0.09 square miles (56 acres); FIPS code is 64740 [SourceCBP]