There are 25 US Post Offices in Summit County serving a total of 412,166 residents equating to 16,487 residents per post office. It's estimated that approximately 657,863 packages are handled across the 25 county post offices annually. Summit County is an urban county in the U.S. state of Ohio. As of the 2010 census, the population was 541,781 making it the fourth-most populous county in Ohio. Its county seat is Akron. The county was formed on March 3, 1840, from portions of Medina, Portage and Stark Counties. It was named \"Summit County\" because the highest elevation on the Ohio and Erie Canal is located in the county. Summit County is part of the Akron, OH Metropolitan Statistical Area, which is also included in the Cleveland-Akron-Canton, OH Combined Statistical Area."