San Juan -- U.S. County in Colorado Population (2000): 558 Housing Units (2000): 632 Land area (2000): 387.422900 sq. miles (1003.420663 sq. km) Water area (2000): 0.862102 sq. miles (2.232833 sq. km) Total area (2000): 388.285002 sq. miles (1005.653496 sq. km) Located within: Colorado (CO), FIPS 08 Location: 37.809073 N, 107.674865 W Headwords: San Juan San Juan, CO San Juan County San Juan County, CO