US PROFESSIONAL LEAGUES BY LEAGUE
AMERICAN LEAGUE
NATIONAL LEAGUE
AAA - INTERNATIONAL LEAGUE (3 April to 1 Sep)
AAA - PACIFIC COAST LEAGUE (9 April to 7 Sep)
AA - SOUTHERN LEAGUE (9 April to 7 Sep)
NORTH
SOUTH
AA - TEXAS LEAGUE (5 April to 3 Sep)
AA - EASTERN LEAGUE (8 April to 1 Sep)
A (Advanced) - CALIFORNIA LEAGUE (9 April to 7 Sep)
A (Advanced) - CAROLINA LEAGUE (9 April to 7 Sep)
A (Advanced) - FLORIDA LEAGUE (9 April to 8 Sep)
A - SOUTH ATLANTIC LEAGUE (9 April to 6 Sep)
A - MIDWEST LEAGUE (9 April to 7 Sep)
EAST
WEST
A (SHORT SEASON) - NEW YORK PENN. LEAGUE (19 Jun to 6 Sep)
A (SHORT SEASON) - NORTHWEST LEAGUE (20 June to 6 Sep)
ROOKIE - PIONEER LEAGUE (June to 5 Sep)
ROOKIE - APPALACHIAN LEAGUE (June to 29 Aug)
ROOKIE - GULF COAST LEAGUE (19 June to 27 Aug)
ROOKIE - ARIZONA LEAGUE