South Haven is a city in Wright County, Minnesota, United States. The population was 187 at the 2010 census. The official South Haven we…South Haven is a city in Wright County, Minnesota, United States. The population was 187 at the 2010 census. The official South Haven website can be found here. South Haven was platted in 1888 when the railroad was extended to that point. The city was so named for the fact it is located in Southside Township and due south of Fair Haven Township, Stearns County. A post office has been in operation at South Haven since 1887. South Haven was incorporated in 1902.