There are 6 US Post Offices in Isanti County serving a total of 34,681 residents equating to 5,780 residents per post office. It's estimated that approximately 55,355 packages are handled across the 6 county post offices annually. Isanti County (/a\u026a\u02c8s\u00e6nti\u02d0/ eye-SAN-tee) is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 37,816. Its county seat is Cambridge. Isanti is derived from the Dakota word meaning \"knife\" and refers to the Santee tribe. Isanti County is included in the Minneapolis-St. Paul-Bloomington, MN Metropolitan Statistical Area."