There are 16 US Post Offices in Adams County serving a total of 482,024 residents equating to 30,127 residents per post office. It's estimated that approximately 769,364 packages are handled across the 16 county post offices annually. Adams County is the fifth-most populous of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 441,603. The county seat is Brighton. The county is named for Alva Adams, Governor of the State of Colorado. Adams County is part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area."