There are 5 US Post Offices in Sherburne County serving a total of 84,290 residents equating to 16,858 residents per post office. It's estimated that approximately 134,536 packages are handled across the 5 county post offices annually. Sherburne County is a county in the U.S. state of Minnesota. As of the 2010 census, the population was 88,499. The county seat is Elk River. Sherburne County is included in the Minneapolis-St. Paul-Bloomington, MN-WI Metropolitan Statistical Area."