Michigan's 12th congressional district is a U.S. congressional district in Michigan.
The district was first created during the reapportionment and redistricting after the 1890 census. From 2003 to 2013, it was located in Detroit's inner suburbs to the north, along the Interstate 696 corridor in Macomb and Oakland counties, and a portion of Macomb north of the corridor. District boundaries were redrawn in 1993 and 2003 due to reapportionment following the censuses of 1990 and 2000. After Michigan's congressional map was redrawn in 2022, the 12th lost Ann Arbor and most of its suburbs and was re-centered around the cities of Detroit and Dearborn.
During the 113th Congress (2013 to 2015), the district was represented by John Dingell (D). He was a congressman for this and other districts for 59 years, making him the longest-serving member of Congress in U.S. history. He was succeeded by his wife, Debbie Dingell, who currently represents the 6th congressional district. The current district is represented by Democrat Rashida Tlaib, who had previously represented the old 13th district. With a Cook Partisan Voting Index rating of D+21, it is one of the most Democratic districts in Michigan.
For the 118th and successive Congresses (based on redistricting following the 2020 census), the district contains all or portions of the following counties and municipalities:
Oakland County (6)
Wayne County (8)