Montrose is a home rule municipality that is the county seat and the most populous municipality of Montrose County, Colorado, United States. …Montrose is a home rule municipality that is the county seat and the most populous municipality of Montrose County, Colorado, United States. The city population was 20,291 at the 2020 census, within a total area of 18.5 square miles. The main road that leads in and out of Montrose is U.S. Highway 50.
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