Here is the listing of Obsolete Minor Sports Leagues and their year of founding. These leagues are considered to be obsolete because they are one or more of the following: A) Limited to a small region, B) Did not last, C) Contributed nil or minimal development to any Major Sports Leagues.
Baseball
International Association (1877)
League Alliance (1877)
New England Association (1877)
Pacific Coast League (1878)
California League (1879)
National Association (1879)
Northwestern League (1879)
Pacific League (1879)
Eastern Association (1881)
New California League (1881)
Inter-State Association (1883)
Western Inter-State Association (1883)
Connecticut State League (1884)
California League (1884)
Iron & Oil Association (1884)
Keystone Association (1884)
Massachusetts State Association (1884)
Ohio Association (1884)
California State League (1885)
Canadian League (1885)
Colorado State League (1885)
Eastern New England League (1885)
Inter-State League (1885)
Southern New England League (1885)
Central New York League (1886)
Hudson River League (1886)
Gulf League (1886)
New England League (1886)
New Hampshire State League (1886)
Pennsylvania State Association (1886)
Virginia League (1886)
Central Pennsylvania League (1887)
Kansas State League (1887)
Ohio State League (1887)
National Colored League (1887)
Northeastern League (1887)
Northern Michigan League (1887)
Southwestern League (1887)
Central League (1888)
Central Inter-State League (1888)
Eastern International League (1888)
Indiana State League (1888)
New England Inter-State League (1888)
Atlantic Association (1889)
Delaware State League (1889)
Illinois-Indiana League (1889)
Michigan State League (1889)
Middle States League (1889)
Ohio State League (1889)
Western Pennsylvania League (1889)
New Brunswick League (1890)
Pacific Northwestern League (1890)
Upper Peninsula League (1890)
Western New York League (1890)
Western New York-Pennsylvania League (1890)
Black Hills League (1891)
Northwestern League (1891)
Pacific Inter-State League (1891)
Wisconsin State League (1891)
Central New Jersey League (1892)
Florida State League (1892)
Montana State League (1892)
Michigan-Wisconsin League (1892)
Nebraska State League (1892)
Mississippi State League (1893)
Oregon State League (1893)
Ohio-Michigan League (1893)
Arkansas State League (1894)
Inter-State League (1894)
Virginia League (1894)
Western Association (1894)
Canadian League (1895)
Eastern Iowa League (1895)
Iron and Oil League (1895)
Kansas State League (1895)
Western Inter-State League (1895)
Atlantic League (1896)
New Pacific League (1896)
California League (1896)
Indiana State League (1896)
International League (1896)
Kentucky-Indiana League (1896)
Pennyrile League (1896)
Cumberland Valley League (1896)
Central League (1897)
Maine State League (1897)
New Jersey State League (1897)
New York State League (1897)
Ohio-West Virginia League (1897)
Red River Valley League (1897)
Southeastern League (1897)
Ohio State League (1898)
Pacific Coast League (1898)
Pacific States League (1898)
Indiana-Illinois League (1899)
Southern California League (1899)
North Carolina Association (1900)
Provincial League (1900)
Utah-Idaho (Intermountain) League (1900)
Central League (1900)
Illinois-Iowa-Indiana League (1901)
Missouri Valley League (1901)
Northern New York League (1901)
Cotton States League (1902)
Iowa-South Dakota League (1902)
Missouri Valley League (1902)
Pennsylvania State League (1902)
Central League (1903)
Hudson River League (1903)
Kentucky-Illinois-Tennessee League (1903)
Southwest Iowa League (1903)
Southwest Washington League (1903)
Inter-State League (1903)
Tennessee-Alabama League (1903)
Canadian Eastern Association (1904)
Southern Tier Association (1904)
Tri-State League (1904)
Vermont League (1904)
Copper Country Soo League (1905)
Empire State League (1905)
Inter-State League (PA) (1905)
Kansas State League (1905)
Missouri Valley League (1905)
North Texas State League (1905)
Ohio-Pennsylvania League (1905)
Pacific National League (1905)
Tri-State League (AL-TN-GA) (1905)
West Texas League (1905)
Wisconsin Association (1905)
Arkansas-Texas League (1906)
Georgia State League (1906)
Inter-State Association (1906)
Pennsylvania-Ohio-Maryland League (1906)
South Central League (1906)
Southern Michigan Association (1906)
Virginia League (1906)
Atlantic League (1907)
Eastern Illinois League (1907)
Gulf Coast League (1907)
New Hampshire State League (1907)
Ohio-Indiana League (1907)
Pennsylvania-Maryland-West Virginia League (1907)
South Carolina League (1907)
Vermont State League (1907)
Western Canada League (1907)
Western Pennsylvania League (1907)
Atlantic Association (1908)
Atlantic League (1908)
Blue Grass League (1908)
Carolina Association (1908)
Central Kansas League (1908)
Eastern Carolina League (1908)
Illinois-Missouri League (1908)
Inland Empire League (1908)
International League (1908)
Ohio State League (1908)
Oklahoma State League (1908)
Pennsylvania-New Jersey League (1908)
Pennsylvania-West Virginia League (1908)
Union League (1908)
Eastern Association (1909)
Northeast Arkansas League (1909)
Northern State of Indiana League (1909)
Hockey
Football
Basketball
New England Basketball League (1903)
Western Massachusetts Basketball League (1903)
Western Pennsylvania Basketball League (1903)
New England Basketball Association (1904)
Central Basketball League (1906)
Eastern Basketball League (1909)
Hudson River Basketball League (1909)
Alternate Major Leagues
American League of Professional Football (1894)
National Association Foot Ball League (1895)
World Series of Football (1902)
Eastern Soccer League (1909)
1877
International Association (Baseball)
League Alliance (Baseball)
New England Association (Baseball)
1878
Pacific Coast League (Baseball)
1879
California League (Baseball)
National Association (Baseball)
Northwestern League (Baseball)
Pacific League (Baseball)
1881
Eastern Association (Baseball)
New California League (Baseball)
1883
Inter-State Association (Baseball)
Western Inter-State Association (Baseball)
1884
Connecticut State League (Baseball)
California League (Baseball)
Iron & Oil Association (Baseball)
Keystone Association (Baseball)
Massachusetts State Association (Baseball)
Ohio Association (Baseball)
1885
California State League (Baseball)
Canadian League (Baseball)
Colorado State League (Baseball)
Eastern New England League (Baseball)
Inter-State League (Baseball)
Southern New England League (Baseball)
1886
Central New York League (Baseball)
Gulf League (Baseball)
Hudson River League (Baseball)
New England League (Baseball)
New Hampshire State League (Baseball)
Pennsylvania State Association (Baseball)
Virginia League (Baseball)
1887
Central Pennsylvania League (Baseball)
Kansas State League (Baseball)
Ohio State League (Baseball)
National Colored League (Baseball)
Northeastern League (Baseball)
Northern Michigan League (Baseball)
Southwestern League (Baseball)
1888
Central League (Baseball)
Central Inter-State League (Baseball)
Eastern International League (Baseball)
Indiana State League (Baseball)
New England Inter-State League (Baseball)
1889
Atlantic Association (Baseball)
Delaware State League (Baseball)
Illinois-Indiana League (Baseball)
Michigan State League (Baseball)
Middle States League (Baseball)
Ohio State League (Baseball)
Western Pennsylvania League (Baseball)
1890
New Brunswick League (Baseball)
Pacific Northwestern League (Baseball)
Upper Peninsula League (Baseball)
Western New York League (Baseball)
Western New York-Pennsylvania League (Baseball)
1891
Black Hills League (Baseball)
Northwestern League (Baseball)
Pacific Inter-State League (Baseball)
Wisconsin State League (Baseball)
1892
Central New Jersey League (Baseball)
Florida State League (Baseball)
Montana State League (Baseball)
Michigan-Wisconsin League (Baseball)
Nebraska State League (Baseball)
1893
Mississippi State League (Baseball)
Oregon State League (Baseball)
Ohio-Michigan League (Baseball)
1894
Arkansas State League (Baseball)
Inter-State League (Baseball)
Virginia League (Baseball)
Western Association (Baseball)
American League of Professional Football (Soccer)
1895
Canadian League (Baseball)
Eastern Iowa League (Baseball)
Iron and Oil League (Baseball)
Kansas State League (Baseball)
Western Inter-State League (Baseball)
National Association Foot Ball League (Soccer)
1896
Atlantic League (Baseball)
New Pacific League (Baseball)
California League (Baseball)
Indiana State League (Baseball)
International League (Baseball)
Kentucky-Indiana League (Baseball)
Pennyrile League (Baseball)
Cumberland Valley League (Baseball)
1897
Central League (Baseball)
Maine State League (Baseball)
New Jersey State League (Baseball)
New York State League (Baseball)
Ohio-West Virginia League (Baseball)
Red River Valley League (Baseball)
Southeastern League (Baseball)
1898
Ohio State League (Baseball)
Pacific Coast League (Baseball)
Pacific States League (Baseball)
1899
Indiana-Illinois League (Baseball)
Southern California League (Baseball)
1900
North Carolina Association (Baseball)
Provincial League (Baseball)
Utah-Idaho (Intermountain) League (Baseball)
Central League (Baseball)
1901
Illinois-Iowa-Indiana League (Baseball)
Missouri Valley League (Baseball)
Northern New York League (Baseball)
1902
Cotton States League (Baseball)
Iowa-South Dakota League (Baseball)
Missouri Valley League (Baseball)
Pennsylvania State League (Baseball)
World Series of Football (Indoor Football)
1903
Central League (Baseball)
Hudson River League (Baseball)
Kentucky-Illinois-Tennessee League (Baseball)
Southwest Iowa League (Baseball)
Southwest Washington League (Baseball)
Inter-State League (Baseball)
Tennessee-Alabama League (Baseball)
New England Basketball League (Basketball)
Western Massachusetts Basketball League (Basketball)
Western Pennsylvania Basketball League (Basketball)
1904
Canadian Eastern Association (Baseball)
Southern Tier Association (Baseball)
Tri-State League (Baseball)
Vermont League (Baseball)
New England Basketball Association (Basketball)
1905
Copper Country Soo League (Baseball)
Empire State League (Baseball)
Inter-State League (PA) (Baseball)
Kansas State League (Baseball)
Missouri Valley League (Baseball)
North Texas State League (Baseball)
Ohio-Pennsylvania League (Baseball)
Pacific National League (Baseball)
Tri-State League (AL-TN-GA) (Baseball)
West Texas League (Baseball)
Wisconsin Association (Baseball)
1906
Arkansas-Texas League (Baseball)
Georgia State League (Baseball)
Inter-State Association (Baseball)
Pennsylvania-Ohio-Maryland League (Baseball)
South Central League (Baseball)
Southern Michigan Association (Baseball)
Virginia League (Baseball)
Central Basketball League (Basketball)
1907
Atlantic League (Baseball)
Eastern Illinois League (Baseball)
Gulf Coast League (Baseball)
New Hampshire State League (Baseball)
Ohio-Indiana League (Baseball)
Pennsylvania-Maryland-West Virginia League (Baseball)
South Carolina League (Baseball)
Vermont State League (Baseball)
Western Canada League (Baseball)
Western Pennsylvania League (Baseball)
1908
Atlantic Association (Baseball)
Atlantic League (Baseball)
Blue Grass League (Baseball)
Carolina Association (Baseball)
Central Kansas League (Baseball)
Eastern Carolina League (Baseball)
Illinois-Missouri League (Baseball)
Inland Empire League (Baseball)
International League (Baseball)
Ohio State League (Baseball)
Oklahoma State League (Baseball)
Pennsylvania-New Jersey League (Baseball)
Pennsylvania-West Virginia League (Baseball)
Union League (Baseball)
1909
Eastern Association (Baseball)
Northeast Arkansas League (Baseball)
Northern State of Indiana League (Baseball)
Eastern Basketball League (Basketball)
Hudson River Basketball League (Basketball)
Eastern Soccer League (Soccer)