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Flat River

1. Flat River, Missouri, United States [City]; population was 4,823 in 1990; housing units was 2,086 in 1990; location is 37°51'N 90°31'W; land area is 3.53 square miles (2,262 acres); water area is 0.01 square miles (4 acres); FIPS code is 24490 [SourceCBP]
2. Flat River, Missouri, United States [Populated Place] is in St. Francois County; location is 37°51'4"N 90°31'14"W [SourceGSP]
3. Flat River, Missouri, United States Postal Service Zip Code is 00636 (Flat River, Mo 636), 63601 (Desloge), 63644 (Frankclay), 63653 (Leadwood) [SourcePSZ]