There are 3 US Post Offices in Sedgwick County serving a total of 2,366 residents equating to 789 residents per post office. It's estimated that approximately 3,776 packages are handled across the 3 county post offices annually. Sedgwick County is the northeasternmost of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 2,379. The county seat is Julesburg. The county was named for Fort Sedgwick, a military post along the Platte Trail, which was named for General John Sedgwick."