Rosemont, IL -- U.S. village in Illinois Population (2000): 4224 Housing Units (2000): 1745 Land area (2000): 1.742876 sq. miles (4.514029 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.742876 sq. miles (4.514029 sq. km) FIPS code: 65819 Located within: Illinois (IL), FIPS 17 Location: 41.990730 N, 87.873816 W ZIP Codes (1990): 60018 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Rosemont, IL Rosemont