Interstate 55 (I-55) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route, connecting the Gulf of Mexico to the Great Lakes. The highway travels from LaPlace, Louisiana, at I-10 to Chicago, Illinois, at U.S. Route 41, at McCormick Place. The major cities that I-55 connects to are New Orleans, Louisiana; Jackson, Mississippi; Memphis, Tennessee; St. Louis, Missouri; and Chicago, Illinois.

Jackson is the capital of and the most populous city in the U.S. state of Mississippi. Along with Raymond, Jackson is one of two county seats for Hinds County. The city had a population of 153,701 at the 2020 census, a significant decline from 173,514, or 11.42%, since the 2010 census, representing the largest decline in population during the decade of any major U.S. city. Jackson is the anchor for the Jackson metropolitan statistical area, the largest metropolitan area located entirely in the state and the tenth-largest urban area in the Deep South. With a 2020 population of nearly 600,000, metropolitan Jackson is home to over one-fifth of Mississippi's population. The city sits on the Pearl River and is located in the greater Jackson Prairie region of Mississippi. Jackson is the only city in Mississippi with a population exceeding 100,000 people.