Freeport is a city in Stearns County, Minnesota, United States. The population was 632 at the 2010 census. Freeport is part of the St. Cl…Freeport is a city in Stearns County, Minnesota, United States. The population was 632 at the 2010 census. Freeport is part of the St. Cloud Metropolitan Statistical Area. A post office called Freeport has been in operation since 1881. The city was named after Freeport, Illinois. Freeport was incorporated in 1892. The city contains two properties listed on the National Register of Historic Places: the 1905 Church of the Sacred Heart and remnants of the 1898 Swany White Flour Mills.