Colorado ranks eighth in size among the 50 states in the US covering a total area of 104,091 sq mi (269,596 sq km), of which 103,595 sq mi (268,311 sq km) consists of land and 496 sq mi (1,285 sq km) comprise inland water. It is located in the Rocky Mountain Region. It is shaped like a perfect rectangle and extends 387 mi (623 km) East–West and 276 mi (444 km) North–South. Denver is the capital of Colorado.

Colorado is bordered on the North by Wyoming and Nebraska; on the East by Nebraska and Kansas; on the South by Oklahoma and New Mexico; and on the West by Utah (with the New Mexico and Utah borders meeting at Four Corners). The total length of Colorado's boundaries is 1,307 mi (2,103 km).