There are 7 US Post Offices in Roseau County serving a total of 15,190 residents equating to 2,170 residents per post office. It's estimated that approximately 24,245 packages are handled across the 7 county post offices annually. Roseau County is a county located in the U.S. state of Minnesota, along the Canada\u2013US border. As of the 2010 census, the population was 15,629. Its county seat is Roseau. It is south from the border with Manitoba."