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.

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.