There are 6 US Post Offices in Washington County serving a total of 4,424 residents equating to 737 residents per post office. It's estimated that approximately 7,061 packages are handled across the 6 county post offices annually. Washington County is one of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 4,814. The county seat is Akron. The county was named in honor of the United States President George Washington."