Center Line is a city in Macomb County in the U.S. state of Michigan. An inner-ring suburb of Detroit, Center Line is located roughly 11 miles (17.7 km) north of downtown Detroit, and is completely surrounded by the larger city of Warren. As of the 2020 census, the city had a population of 8,552.

Warren is a city in Macomb County in the U.S. state of Michigan. An inner-ring suburb of Detroit, Warren borders Detroit to the north, roughly 13 miles (20.9 km) north of downtown Detroit. As of the 2020 census, the city had a population of 139,387, making Warren the largest community in Macomb County, the third-largest city in Michigan, and Detroit's largest suburb.