Since the 6th congressional district's creation, its boundaries have migrated from a position astraddle the Mississippi River to completely east of the Mississippi River and more recently astraddle the river again.
For decades prior to 1974, the district was virtually coterminous with the Florida Parishes. In 1974, the 6th congressional district shed St. Tammany Parish to the 1st congressional district, and since then several redistrictings have incrementally moved the district's boundaries westward so that it has shed both Washington and Tangipahoa parishes (including Hammond, home of James H. Morrison, who represented the district for 24 years, the longest tenure of anyone ever to represent the district) to the 1st district.
For most of its existence, the district's lines generally followed parish lines. In the 1990s redistricting, however, most of the district's black voters were transferred to the black-majority 4th district. Those lines, however, were thrown out in 1995 when the 4th was ruled to be an unconstitutional racial gerrymander, and from 1996 to 2013, the 6th included all of Baton Rouge. After the 2010 redistricting, a gash in western Baton Rouge, including most of the city's black precincts, was transferred to the New Orleans–based 2nd district.
Following a court ruling striking down Louisiana's 2022 congressional map for violating the Voting Rights Act, a new map enacted by a special legislative session on January 22, 2024 dismantled the district and it stretched from Caddo Parish in the North West to East Baton Rouge Parish, and will include a majority African-American voting-age population.
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