Summit -- U.S. County in Colorado Population (2000): 23548 Housing Units (2000): 24201 Land area (2000): 608.161860 sq. miles (1575.131920 sq. km) Water area (2000): 11.089165 sq. miles (28.720803 sq. km) Total area (2000): 619.251025 sq. miles (1603.852723 sq. km) Located within: Colorado (CO), FIPS 08 Location: 39.574638 N, 106.070643 W Headwords: Summit Summit, CO Summit County Summit County, CO