The Stockton Ports are a Minor League Baseball team of the California League and the Single-A affiliate of the Oakland Athletics. They are located in Stockton, California, and are named for the city's seaport. The team plays its home games at Banner Island Ballpark which opened in 2005 and seats over 5,000 people. The Ports were established in 1941 as members of the California League and have won the California League championship 11 times.