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The city of Marion is the county seat of Williamson County, Illinois. Today Marion serves as the largest retail trade center in Southern Illinois with its central location along Interstate 57 and Illinois Route 13 (colloquially known as Southern Illinois' "Main Street"). It's home to the Illinois Centre mall (recently renamed the Illinois Star Centre) and the Southern Illinois Miners baseball team, and is in the process of being selected for Illinois' first STAR Bonds District for the proposed Millennium Development.