St. Ignace, Michigan, United States [City]; population was 2,568 in 1990; housing units was 1,226 in 1990; location is 45°52'N 84°44'W; land area is 2.71 square miles (1,733 acres); water area is 0.01 square miles (6 acres); FIPS code is 70840 [SourceCBP]