There are 9 US Post Offices in Montrose County serving a total of 54,537 residents equating to 6,060 residents per post office. It's estimated that approximately 87,047 packages are handled across the 9 county post offices annually. Montrose County is one of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 41,276. The county seat is Montrose, for which the county is named. Montrose County comprises the Montrose, CO Micropolitan Statistical Area."