Aspen, CO -- U.S. city in Colorado Population (2000): 5914 Housing Units (2000): 4354 Land area (2000): 3.529800 sq. miles (9.142139 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.529800 sq. miles (9.142139 sq. km) FIPS code: 03620 Located within: Colorado (CO), FIPS 08 Location: 39.192297 N, 106.824470 W ZIP Codes (1990): 81611 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Aspen, CO Aspen