Macomb County is a county located in the eastern portion of the U.S. state of Michigan, bordering Lake St. Clair, and is part of northern Metro Detroit. As of the 2020 Census, the population was 881,217, making it the third-most populous county in the state. The county seat is Mt. Clemens. Macomb County is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. The city of Detroit is located on the county's southern border. Macomb County contains 27 cities, townships and villages, including three of the top ten most-populous municipalities in Michigan as of the 2020 census: Warren (#3), Sterling Heights (#4) and Clinton Township (#8). Most of this population is concentrated south of Hall Road (M-59), one of the county's main thoroughfares.

Metro Detroit is a major metropolitan area in the U.S. state of Michigan, consisting of the city of Detroit and over 200 municipalities in the surrounding area with its largest employer being Oakland County. There are varied definitions of the area, including the official statistical areas designated by the Office of Management and Budget, a federal agency of the United States.