Center Line is a city in Macomb County in the U.S. state of Michigan, surrounded entirely by the city of Warren. The population was 8,257 at the 2010 census.
Historically, the land that Center Line came to occupy was swamp and wilderness until the early nineteenth century. As land became scarce, French, German, Belgian, and Irish immigrants began clearing the forests and draining the swamps. Center Line was known as Kunrod's Corner during the mid-nineteenth century. The theory is that the French named it Center Line because it was the middle of three Potowatomi trails from Fort Detroit to northern trading posts. The 'center line' was the trail used from Detroit to Utica. The community received its initial start when Catholics decided to build a church so that they would not have to walk to St. Mary's in Detroit for Sunday Mass. This church (St.