The Northern League, was an independent baseball league which merged with the Golden Baseball League and the United Baseball League to form the North American League. It was affiliated with neither Major League Baseball nor the organized minor leagues.
Former teams (1993–2010) Rochester Aces (1994 became Winnipeg Goldeyes) Thunder Bay Whiskey Jacks (1999 became Schaumburg Flyers) Madison Black Wolf (2001 became Lincoln Saltdogs) Duluth–Superior Dukes (2003 became Kansas City T-Bones) St. Paul Saints (2005 left to create American Association) Lincoln Saltdogs (2005 left to create American Association) Schaumburg Flyers (folded in 2011 before joining North American League) Sioux Falls Canaries (2005 left to create American Association) Sioux City Explorers (2005 left to create American Association) Calgary Vipers (2007 left to join Golden Baseball League, have since folded) Edmonton Cracker-Cats (2007 left to join Golden Baseball League, has since changed name to Edmonton Capitals) Fargo-Moorhead RedHawks (2010 left to join American Association) Gary SouthShore RailCats (2010 left to join American Association) Kansas City T-Bones (2010 left to join American Association) Winnipeg Goldeyes (2010 left to join American Association)
Former Northern League East teams (1999–2002) (Left to re-form Northeast League, then later the Can-Am League)
Adirondack Lumberjacks (1995–2003); team later moved to Bangor, Maine and then folded Albany-Colonie Diamond Dogs (1995–2002); team later folded Allentown Ambassadors (1997–2003); team later folded Berkshire Black Bears (2002–2003); team later moved to New Haven, Connecticut and then folded Brockton Rox (2002–2011); team now plays in Futures Collegiate Baseball League Catskill Cougars (2000) Elmira Pioneers (1996–2005); team now plays in New York Collegiate Baseball League Massachusetts Mad Dogs (1997–1999); team became inactive for three years New Jersey Jackals (1998-) Les Capitales de Québec (1999-) Waterbury Spirit (1997–2000); team revived as North Shore Spirit in 2003 in Lynn, Massachusetts, later folded