Rochester is a city in the U.S. state of Minnesota and is the county seat of Olmsted County. Located on both banks of the Zumbro River, the city has a population of 106,769 according to the 2010 United States Census. The U.S. Census Bureau estimated 2012 population is 108,992. It is Minnesota's third-largest city and the largest city located outside of the Minneapolis-St. Paul-Bloomington Metropolitan Statistical Area. As of 2012, the Rochester metropolitan area has a population of 209,607.