Colorado's capital is DENVER, which is a city located in the U.S. state of Colorado. It is the most populous city in the state and the 19th most populous city in the United States. DENVER is also the capital of the state of Colorado and the county seat of DENVER County. The city is situated on the South Platte River in the High Plains region of the Rocky Mountains. DENVER is known for its vibrant culture, outdoor activities, and diverse population.