Colorado County is a county located in the state of Colorado. It is home to five different counties, Mesa, Otero, ASPEN, Yuma, and Ute. Mesa County is the most populous county in the state, with a population of over 150, 000 people. Otero County is the second most populous county in the state, with a population of over 50, 000 people. ASPEN County is the third most populous county in the state, with a population of over 30, 000 people. Yuma County is the fourth most populous county in the state, with a population of over 20, 000 people. Finally, Ute County is the fifth most populous county in the state, with a population of over 10, 000 people. All five counties are located in the western part of the state and are known for their beautiful landscapes and outdoor activities.