Major League Baseball history features a select group of charter franchises that have maintained complete geographic stability since their inception, never relocating to a different city. While lists can vary slightly depending on historical classifications of nineteenth-century leagues, six historic National League mainstays that have continuously operated in their original home markets without ever changing cities are the Chicago Cubs, Cincinnati Reds, Philadelphia Phillies, Pittsburgh Pirates, St. Louis Cardinals, and the Detroit Tigers from the American League. These venerable organizations represent the deepest roots in American professional baseball, maintaining unbroken ties to their original municipal fan bases for well over a century.