Winthrop, AR -- U.S. city in Arkansas Population (2000): 186 Housing Units (2000): 83 Land area (2000): 1.071959 sq. miles (2.776360 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.071959 sq. miles (2.776360 sq. km) FIPS code: 76250 Located within: Arkansas (AR), FIPS 05 Location: 33.831338 N, 94.353629 W ZIP Codes (1990): 71866 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Winthrop, AR Winthrop