Banner Island Ballpark is an unofficial name used by fans and the Port Authority of Stockton. However, the city owns the right to name the stadium, and until this privilege is lost, the sports facility is officially listed everywhere as Stockton Ballpark. The baseball field is informally called the Banner Island Ballpark due to the location of the area. It was once located on an island located in the San Joaquin Delta. During the Civil War, supporters of the Union placed huge “star-flat” flags on it. After a while, it was connected to the mainland through a landfill. Only the southern coast remained. However, despite the fact that this place has ceased to be an island, the name has been preserved.