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 | Official name: State of Colorado Colorado postal code abbreviation: CO You may also be interested in the answers to the following questions: Total area: 269 837 km2 ✅ What is the largest city by population in Colorado?- Largest Colorado cities by population: Denver ✅ What is the capital of Colorado?- State capital of Colorado: Denver ✅ What is the population of Colorado?- Colorado state population 2025: 5 116 769 |