South Haven is a city in the U.S. state of Michigan. Most of the city is in Van Buren County, although a small portion extends into Allegan Co…South Haven is a city in the U.S. state of Michigan. Most of the city is in Van Buren County, although a small portion extends into Allegan County. The population was 3,964 at the 2020 census. Because of its position on Lake Michigan, at the mouth of the Black River, South Haven has always been a port city. During settlement, major ship lines stopped there, both passenger and freight. In the early 1900s South Haven became a resort town, sometimes referred to as "The Catskills of the Midwest." South Haven is a major regional tourist draw because of its recreational harbor and beaches. It is the western terminus of the Kal-Haven Trail, popular with bicyclists and snowmobilers. Nearby are Van Buren State Park and the Van Buren Trail State Park.