The State of Colorado is a state located in the Rocky Mountain region of the United States of America. Colorado may also be considered to be a part of the Western and Southwestern regions of the United States. The United States Census Bureau estimates that the state population was 4,861,515 in 2007, a 13.03% increase since the U.S. Census 2000. Denver is the capital as well as the most populous city of Colorado.
The State of Colorado is defined as the geoellipsoidal rectangle that stretches from 37°N to 41°N latitude and from 102°03'W to 109°03'W longitude (25°W to 32°W from the Washington Meridian). Colorado, Wyoming, and Utah are the only three U.S. states that have only lines of latitude and longitude for boundaries and that have no natural borders.