# List of defunct minor baseball leagues in the United States

This is a sortable list of defunct minor baseball leagues in the United States. Minor league affiliated Canada and Mexico leagues are also listed, as are leagues with team members in Canada, Cuba and Mexico.

## List

| League | State(s) | Designation(s) | Years |
| Alabama-Florida League | Alabama, Florida | Class D | 1936–1939, 1951–1962 |
| Alabama-Mississippi League | Alabama, Mississippi | Class D | 1936 |
| Alabama State League | Alabama | Class D | 1940–1941, 1956–1950 |
| Alabama-Tennessee League | Alabama, Tennessee | Class D | 1921 |
| All-American Association | Alabama, Louisiana, Tennessee, Texas | Independent | 2001 |
| American Association | Colorado, Indiana, Iowa, Kansas, Kentucky, Louisiana, Minnesota, Missouri, Nebraska, New York, Ohio, Oklahoma, Texas, West Virginia, Wisconsin | Class A (1903–1911) Class AA (1912–1945) Class AAA (1946–1962, 1969–1997) | 1902–1962, 1969–1997 |
| Anthracite League | Pennsylvania | Class D | 1928 |
| Appalachian League | Tennessee, North Carolina, Virginia, West Virginia | Class D (1911–1914, 1921–1925, 1937–1955, 1957–1962) Rookie (1963–2020) | 1911–1914, 1921–1925, 1937–1955, 1957–2020. |
| Arizona Instructional League | Arizona | Winter Rookie | 1960–1991 |
| Arizona League | Arizona | Independent | 1897 |
| Arizona-Mexico League | Arizona, Mexico | Class C | 1955–1958 |
| Arizona-Mexico League II | Arizona, Mexico | Independent | 2003 |
| Arizona Rookie League | Arizona | Winter Rookie | 1964 |
| Arizona State League | Arizona | Class D | 1928–1930 |
| Arizona-Texas League | Arizona, Texas | Class D (1931–1932, 1937–1939) Class C (1940–1941, 1947–1950, 1952–1954) | 1931–1932, 1937–1941, 1947–1950, 1952–1954 |
| Arkansas-Louisiana-Texas League | Arkansas, Louisiana, Texas | Negro minor | 1951 |
| Arkansas-Missouri League | Arkansas, Missouri | Class D | 1936–1940 |
| Arkansas State League | Arkansas, Louisiana, Missouri, Texas | Class D | 1893, 1897, 1908–1909, 1934–1935 |
| Arkansas-Texas League | Arkansas, Texas | Class D | 1906 |
| Atlantic Association | Connecticut, Delaware, Massachusetts, Maine, Maryland, New Jersey, Pennsylvania, Rhode Island, Washington, D.C. | Independent (1889–1890) Class D (1908) | 1889–1890, 1908 |
| Atlantic Coast League | North Carolina, South Carolina | Independent | 1995 |
| Atlantic League I | Connecticut, Delaware, New Jersey, New York, Pennsylvania, Virginia | Class A (1896, 1899) Class B (1897–1898) | 1895–1900, 1905, 1907-1909 |
| Atlantic League II | Connecticut, New Jersey, New York | Class D | 1914–1915 |
| Basin League | Nebraska, South Dakota | Independent | 1953–1959 |
| Beaver Valley League | Pennsylvania | Independent | 1894 |
| Bi-State League I | Illinois, Wisconsin | Class D | 1915 |
| Bi-State League II | North Carolina, Virginia | Class D | 1934–1942 |
| Big South League | Arkansas, Mississippi, Tennessee | Independent | 1996–1997 |
| Big State League | Texas | Class B | 1947–1957 |
| Black Hills League | Nebraska, South Dakota | Independent | 1891–1892 |
| Blue Grass League | Kentucky | Class D | 1892, 1896, 1908–1912, 1922–1924 |
| Blue Mountain League | Pennsylvania | Independent | 1907 |
| Blue Ridge League I | Maryland, Pennsylvania, West Virginia | Class D | 1915–1918, 1920–1930 |
| Blue Ridge League II | North Carolina, Virginia | Class D | 1946–1950 |
| Border League I | Michigan, Ontario | Class D | 1912–1913 |
| Border League II | New York, Ontario, Quebec | Class C | 1946–1951 |
| Buckeye League | Ohio | Class D | 1915 |
| California Fall League | California | Winter Rookie | 1998 |
| California League I | California | Class B (1892) Class D (1898) Class E (1899) | 1879–1893, 1896–1897, 1900–1902, 1906–1909 |
| California Players League | California | Independent | 1894 |
| California State League | California | Class D | 1883, 1885–1886, 1888, 1903–1906, 1910, 1912–1915, 1928–1929 |
| California Winter League I | California | Winter League | 1928–1947 |
| Can–Am League | New Jersey, New York, Quebec, Ontario | Independent | 2005–2019 |
| Canadian Association | Canada | Independent | 1895 |
| Canadian Baseball League | Canada | Independent | 2003 |
| Canadian League | Ontario, Pennsylvania | Independent Class D (1899) | 1885–1886, 1893–1894, 1896–1898 |
| Canadian Midland League | Canada | Independent | 1894 |
| Canadian-American League I | Massachusetts, New York, Ontario | Class C | 1936–1942, 1946–1951 |
| Canadian-American League II | Ontario | Independent | 1959 |
| Canal Zone League | Panama | Winter Rookie | 1948–1950 |
| Cape Breton Colliery League | Nova Scotia | Class D (1937–1938) Class C (1939) | 1937–1939 |
| Carolina Association | North Carolina, South Carolina | Class D | 1908–1912 |
| Carolina Baseball League | North Carolina | Independent | 1936–1938 |
| Carolina Interstate League | North Carolina, South Carolina | Independent | 1904 |
| Carolina Textile League | North Carolina | Independent | 1935 |
| Central Association I | Illinois, Iowa, Missouri, Wisconsin | Class D | 1908–1917 |
| Central Association II | Illinois, Iowa, Missouri | Class C | 1947–1949 |
| Central Atlantic League | | Independent | 1888 |
| Central Baseball League | Louisiana, Missouri, Texas | Independent | 2002–2005 |
| Central California League | California | Class D | 1896, 1910–1911 |
| Central Connecticut League | Connecticut | Independent | 1892, 1910–1911 |
| Central International League | Manitoba, Minnesota, North Dakota, Wisconsin | Class C | 1912 |
| Central Interstate League | Illinois, Indiana, Iowa | Independent | 1887–1890 |
| Central Kansas League | Kansas | Class D | 1908–1912 |
| Central League I | New Jersey, New York, Pennsylvania | Independent | 1888 |
| Central League II | Illinois, Indiana, Kentucky, Pennsylvania | Class C | 1897 |
| Central League III | Illinois, Indiana, Michigan, Ohio, Pennsylvania, West Virginia | Class B | 1900, 1903–1917, 1920–1922, 1926, 1928–1930, 1932, 1934 |
| Central League IV | Indiana, Michigan, Ohio, West Virginia | Class A | 1948–1951 |
| Central Mexican League | Mexico | Class C | 1955–1957 |
| Central Nebraska League | Nebraska | Independent | 1903 |
| Central New Jersey League | New Jersey | Independent | 1891–1892 |
| Central New York League | New York | Independent | 1888, 1910 |
| Central Pennsylvania League | Pennsylvania | Independent (1886–1888, 1896, 1898) Class F (1897) | 1886–1888, 1896–1898 |
| Central Texas League | Texas | Class D | 1914–1917 |
| Chicago City League | Illinois | Independent | 1887, 1890, 1892–1894, 1909–1910 |
| Citrus League | Florida | Spring | 1972 |
| Coastal Plain League | North Carolina | Class D | 1937–1941, 1946–1952 |
| Cocoa Rookie League | Florida | Rookie | 1964 |
| Colonial League I | Connecticut, Massachusetts, Rhode Island | Class C | 1914–1915 |
| Colonial League II | Connecticut, New Jersey, New York | Class B | 1947–1950 |
| Colorado State League | Colorado | Independent | 1885, 1889–1891, 1894–1896, 1898 |
| Connecticut Association | Connecticut | Class D | 1910 |
| Connecticut League/Connecticut State League | Connecticut | Class E (1891) Class B (1894, 1905–1912) Class F (1897–1901) | 1884–1885, 1888, 1891, 1894–1895, 1897–1912 |
| Continental Baseball League | Louisiana, New Mexico, Texas | Independent | 2007–2010 |
| Copper Country Soo League | Michigan | Class D | 1904–1905 |
| Cotton States League I | Alabama, Arkansas, Florida, Louisiana, Mississippi | Class D | 1902–1914 |
| Cotton States League II | Arkansas, Louisiana, Mississippi, Texas | Class D | 1919–1932 |
| Cotton States League III | Arkansas, Louisiana, Mississippi, Texas | Class C | 1936–1941, 1947–1955 |
| Cumberland Valley League | Maryland, Pennsylvania | Independent | 1896 |
| Dakota League | North Dakota, South Dakota | Class D | 1921–1922 |
| Dawson League | Yukon | Independent | 1904 |
| Delaware State League | Delaware | Independent | 1889 |
| Delta League | Mississippi | Class D | 1904–1905 |
| Dixie Association | Alabama, Arkansas, Florida, Georgia, Louisiana, New Mexico, North Carolina, Tennessee, Texas | Class AA | 1971 |
| Dixie League I | Alabama, Georgia | Class D | 1916–1917 |
| Dixie League II | Arkansas, Louisiana, Mississippi, Texas | Class C | 1933 |
| East Dixie League | Arkansas, Louisiana, Mississippi | Class C | 1934–1935 |
| East Texas League | Texas | Class D (1916, 1923–1926, 1931) Class C (1936–1940, 1946, 1949–1950) | 1916, 1923–1926, 1931, 1936–1940, 1946, 1949–1950 |
| East Texas Negro League | Louisiana, Texas | Negro minor | 1946 |
| Eastern Association | Connecticut, Massachusetts, New York, Pennsylvania, Rhode Island | Independent (1882, 1901, 1909) Class B (1913–1914) | 1882, 1901, 1909, 1913–1914 |
| Eastern Canada League | Ontario, Quebec | Class B | 1922–1923 |
| Eastern Carolina Baseball Association | North Carolina | Independent | 1920–1922 |
| Eastern Carolina League | North Carolina | Class D | 1908–1910, 1928–1929 |
| Eastern Championship Association | New York, Pennsylvania, Washington D.C. | Independent | 1881 |
| Eastern Illinois League | Illinois, Indiana | Class D | 1907–1908 |
| Eastern Interstate League | Illinois, Pennsylvania | Independent | 1888, 1890, 1895 |
| Eastern Iowa League | Illinois, Iowa | Independent | 1905 |
| Eastern Kansas League | Kansas | Class D | 1910–1911 |
| Eastern League I | Delaware, Maryland, New Jersey, Pennsylvania, Virginia | Independent | 1884–1887 |
| Eastern League II | Connecticut, Maine, Massachusetts, New York, Pennsylvania, Rhode Island, Virginia | Class B (1916–1916) Class A (1919, 1932) | 1916–1919, 1932 |
| Eastern New England League | Maine, Massachusetts | Independent | 1885 |
| Eastern Shore League | Delaware, Maryland, Virginia | Class D | 1922–1928, 1937–1941, 1946–1949 |
| Empire State League | Georgia, New York | Independent (1887) Class D (1913) | 1887, 1913 |
| Empire State League (1987) | New York | Independent | 1987 |
| Empire State League (1905–1907) | New York | Independent 1905–1907 | 1905–1907 |
| Evangeline Baseball League | Louisiana, Mississippi, Texas | Class D (1934–1942, 1946–1948) Class C (1949–1957) | 1934-1942, 1946–1957 |
| Far West League | California, Oregon, Nevada | Class D | 1948–1951 |
| Federal League | Illinois, Indiana, Kentucky, Missouri, Ohio, Pennsylvania | Independent | 1913 |
| Florida-Alabama-Georgia League | Alabama, Florida, Georgia | Class D | 1915 |
| Florida East Coast Instructional League | Florida | Winter Rookie | 1964 |
| Florida East Coast League | Florida | Class D (1946–1948) Rookie (1949–1954) | 1946–1954 |
| Florida Instructional League | Florida | Winter Rookie | 1958–2007 |
| Florida Instructional League North | Florida | Winter Rookie | 1969 |
| Florida Instructional League South | Florida | Winter Rookie | 1969 |
| Florida International League | Cuba, Florida | Class C (1946–1948) Class B (1949–1954) | 1946–1954 |
| Florida Winter League | Florida | Winter | 1960–1961 |
| Geauga County League | Ohio | Independent | 1905 |
| Georgia State League | Georgia | Class D | 1906, 1914, 1920–1921, 1948–1956 |
| Georgia-Alabama League | Alabama, Georgia | Class D | 1913–1917, 1928–1930, 1946–1951 |
| Georgia-Florida League | Florida, Georgia, | Class D (1935–1942, 1946–1958, 1962) Class A (1963) | 1935–1942, 1946–1958, 1962–1963 |
| Great Central League | Illinois, Indiana, Iowa, Minnesota | Independent | 1994 |
| Gulf League | Alabama, Louisiana | Independent | 1886 |
| Gulf States League | Louisiana, Texas | Class A | 1976 |
| Hawaii Winter Baseball | Hawaii | Winter Independent | 1993–2008 |
| Hudson River League | Massachusetts, New York | Class D (1903) Class C (1904–1907) | 1903–1907 |
| Illinois-Indiana League | Illinois, Indiana | Independent | 1889, 1892 |
| Illinois-Indiana-Iowa League (Three-I) | Illinois, Indiana, Iowa, Minnesota, Wisconsin | Class D (1901) Class B (1902–1917, 1919–1932, 1935, 1937–1942, 1946–1961) | 1901–1917, 1919–1932, 1935, 1937–1942, 1946–1961 |
| Illinois-Iowa League | Indiana, Illinois, Iowa | Independent | 1890–1892 |
| Illinois State League | Illinois | Class D | 1947–1948 |
| Illinois-Missouri League | Illinois, Missouri | Class D | 1908–1914 |
| Independent Negro League | Georgia, Louisiana, Maryland, Missouri, Tennessee, New Jersey, New York, Ohio, Pennsylvania, Texas, Washington D.C. | Independent | 1914–1950 |
| Independent Northern League | New York, Ontario | Independent | 1906 |
| Indiana-Michigan League | Indiana, Michigan | Class D | 1921 |
| Indiana-Ohio League | Indiana, Ohio | Class D | 1908 |
| Indiana State League | Indiana | Independent | 1889, 1890, 1900 |
| Inland Empire League | Oregon, Washington | Class D | 1902, 1908 |
| Inter-American League | Florida, Dominican Republic, Panama, Puerto Rico, Venezuela | Class AAA | 1979 |
| International Association for Professional Base Ball Players | Ohio, Ontario, New Hampshire, New York, Massachusetts, Michigan, New Jersey | Independent | 1877–1880, 1888–1900 |
| International League of Independent Professional Base Ball Clubs | Cuba, Delaware, New Jersey, Pennsylvania | Independent | 1906 |
| Interstate Association | Indiana, Michigan, Ohio | Class C | 1906 |
| Interstate League | Indiana, Kentucky, Michigan, Ohio, Pennsylvania, New Jersey, New York, West Virginia | Independent (1896–1901) Class C (1913) Class D (1905–1908, 1914–1916, 1932) | 1896–1901, 1905–1908, 1913–1916, 1932 |
| Iowa State League | Illinois, Iowa | Class D | 1904–1907, 1912 |
| Iowa-South Dakota League | Iowa, South Dakota | Class D | 1902–1903 |
| Iron & Oil Association | Ohio, Pennsylvania | Independent | 1884 |
| Iron & Oil League | New York, Ohio, Pennsylvania, West Virginia | Independent (1885, 1892) Class F (1898) Class C (1895) | 1885, 1892, 1895, 1898 |
| Kansas State League | Kansas, Oklahoma | Independent (1887, 1895–1898) Class D (1905–1906, 1909–1911, 1913–1914) | 1887, 1895–1898, 1905–1906, 1909–1911, 1913–1914 |
| Kansas-Oklahoma-Missouri League (KOM) | Kansas, Missouri, Oklahoma | Class D | 1946–1952 |
| Kentucky–Indiana League | Indiana, Kentucky | Independent | 1896 |
| Kentucky-Illinois-Tennessee League (KITTY) | Illinois, Indiana, Kentucky, Tennessee | Class D | 1903–1906, 1910–1914, 1916, 1922–1924, 1933–1942, 1946–1955 |
| Keystone Association | Pennsylvania | Independent | 1884–1885 |
| League Alliance | Eastern United States | Semi-affiliated | 1877, 1882 |
| Lone Star League | Texas | Class D (1927–1929) Class C (1947–1949) Class A (1977) | 1927–1929, 1947–1949, 1977 |
| Longhorn League | Texas | Class C | 1947–1955 |
| Louisiana State Baseball League | Louisiana | Independent (1915) Class D (1920) | 1915, 1920 |
| Maine State League | Maine, New Hampshire | Independent (1887) Class D (1907–1908) | 1887, 1907–1908 |
| Manitoba-Dakota League (MANDAK) | Manitoba, North Dakota | Independent | 1950–1957 |
| Maryland Fall Baseball | Maryland | Fall | 1998 |
| Massachusetts-Connecticut League | Connecticut, Massachusetts | Class D | 1912 |
| Michigan State League | Michigan | Independent (1889–1890, 1895) Class D (1902, 1911–1914) Class C (1926, 1940–1941) | 1889–1890, 1895, 1902, 1911–1914, 1926, 1940–1941 |
| Michigan-Ontario League | Michigan, Ontario | Class B | 1919–1926 |
| Middle Atlantic League | Maryland, Ohio, New York, Pennsylvania, West Virginia | Class C | 1925–1942, 1946–1951 |
| Middle States League | Connecticut, Delaware, New Jersey, Pennsylvania | Independent | 1889 |
| Middle Texas League | Texas | Class D | 1914–1915 |
| Midwest League | Illinois, Indiana, Iowa, Kentucky, Michigan, Ohio, Wisconsin | Class D (1956–1962) Class A (1963–2020) | 1956–2020 |
| Minnesota-Wisconsin League | Minnesota, Wisconsin | Class C (1911) Class D (1909–1910, 1912) | 1909–1912 |
| Mississippi State League | Mississippi | Class D | 1924 |
| Mississippi Valley League | Illinois, Iowa | Class D (1922–1932) Class B (1933) | 1922–1933 |
| Mississippi-Ohio Valley League | Illinois, Indiana, Iowa, Kentucky, Missouri | Class D | 1949–1955 |
| Missouri-Iowa-Nebraska-Kansas League (MINK) | Iowa, Kansas, Missouri, Nebraska | Class D | 1910–1913 |
| Missouri State League | Missouri | Independent (1896) Class D (1911) | 1896, 1911 |
| Missouri Valley League | Arkansas, Kansas, Missouri, Oklahoma | Independent (1901) Class D (1902–1903) Class C (1904–1905) | 1901–1905 |
| Monongahela League | Pennsylvania | Independent | 1894 |
| Montana State League | Idaho, Montana, Utah | Independent | 1892, 1900, 1909 |
| Mountain State League | Kentucky, West Virginia | Class D (1936–1941) Class C (1942) | 1936–1942 |
| Mountain States League I | Kentucky, Ohio, West Virginia | Class D | 1911–1912 |
| Mountain States League II | Kentucky, Tennessee, Virginia | Class D (1948–1952) Class C (1953–1954) | 1948–1954 |
| Naugatuck Valley League | Connecticut | Independent | 1896 |
| National Association | Massachusetts, New Hampshire, New York, Pennsylvania, Washington D.C. | Independent | 1879–1880 |
| National Association of Colored Baseball Clubs of the United States and Cuba | Cuba, New York, Pennsylvania | Negro minor | 1907–1910 |
| National Colored Base Ball League | Kentucky, Maryland, Massachusetts, New York, Ohio, Pennsylvania, Washington D.C. | Negro minor | 1887 |
| Nebraska State League | Iowa, Kansas, Nebraska, South Dakota | Class B (1892) Class D (1910–1915, 1922–1923, 1928–1938, 1956–1959) | 1892, 1910–1915, 1922–1923, 1928–1938, 1956–1959 |
| Negro American Association | Georgia, Maryland, North Carolina, Pennsylvania, South Carolina, Virginia | Negro minor | 1939, 1948–1949 |
| Negro National Baseball Association | North Carolina, Virginia | Negro minor | 1954 |
| Negro Southeastern League | Alabama, Georgia | Negro minor | 1921 |
| Negro Southern League I | Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Ohio, Tennessee | Negro minor | 1920–1931, 1933–1936 |
| Negro Southern League II | Alabama, Arkansas, Florida, Georgia, Indiana, North Carolina, Tennessee | Negro minor | 1945–1951 |
| Negro Texas League | Alabama, Arkansas, Louisiana, Texas | Negro minor | 1949 |
| Nevada State League | Nevada | Independent | 1907 |
| New Brunswick-Maine League | Maine, New Brunswick | Class D | 1913 |
| New California League | California | Independent | 1881 |
| New England Association | Massachusetts, New Hampshire, Rhode Island | Independent | 1877, 1895 |
| New England League | Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island | Independent (1877, 1886–1888, 1891, 1893, 1894–1898, 1901) Class F (1899) Class B (1892, 1902–1915, 1919, 1926–1930, 1933, 1946–1949) | 1877, 1886–1888, 1891–1899, 1901–1915, 1919, 1926–1930, 1933, 1946–1949 |
| New Hampshire State League | New Hampshire, New York, Vermont | Independent (1885–1886, 1895) Class D (1907) | 1885–1886, 1895, 1907 |
| New Jersey State League | New Jersey | Class D | 1897 |
| New Pacific League | British Columbia, Oregon, Washington | Class C | 1896 |
| New York-New Jersey League | Connecticut, New Jersey, New York | Class D | 1913 |
| New York–Pennsylvania League | New York, Pennsylvania | Class D (1923–1932) Class A (1933–1937) | 1923–1937 |
| New York-Penn League | Connecticut, Maryland, Massachusetts, New York, Ohio, Ontario, Pennsylvania, Vermont, West Virginia | Class A | 1939–2020 |
| New York State League | New York, Pennsylvania | Independent (1885, 1889–1890, 1898) Class B (1894–1895, 1902–1917) Class D (1897, 1899–1901 ) | 1885, 1894–1895, 1897–1917 |
| North Atlantic League | Massachusetts, New Hampshire, New Jersey, New York, Ontario, Pennsylvania | Class D (1946–1950) Independent (1995–1996) | 1946–1950, 1995–1996 |
| North Carolina State League | North Carolina | Class D | 1913–1917, 1937–1953 |
| North Dakota League | North Dakota | Class D | 1923 |
| North Texas League | Arkansas, Texas | Class D | 1905, 1907 |
| Northeast Arkansas League | Arkansas | Class D | 1909–1911, 1936–1941 |
| Northeast League | Maine, Massachusetts, New Jersey, Pennsylvania, Rhode Island | Independent | 1995–1998, 2003–2004 |
| Northeastern League | Connecticut, Massachusetts, New Hampshire, New York, Vermont | Independent (1887, 1895–1896) Class B (1934) | 1887, 1895–1896, 1934 |
| Northern-Copper Country League | Manitoba, Michigan, Minnesota, North Dakota | Class C (1906) Class D (1907) | 1906–1907 |
| Northern Copper Country-Soo League | Manitoba, Michigan, Minnesota, North Dakota | Class D | 1905 |
| Northern League | Manitoba, Michigan, Minnesota, North Dakota, Ontario, South Dakota, Wisconsin | Class D (1902–1905, 1908, 1917, 1933–1940) Class C 1941–1942, 1946–1962) Class A (1963–1971) | 1902–1905, 1908, 1913–1917, 1932–1942, 1932–1942, 1946–1971 |
| Northern Maine League | Maine | Class D | 1909 |
| Northern Michigan League | Michigan | Independent | 1887, 1895 |
| Northern New York League | New York, Vermont | Class D (1902) Independent (1900–1901, 1903–1905) | 1900–1905 |
| Northern State of Indiana League | Indiana | Class D | 1909–1911 |
| Northern Utah League | Idaho, Utah | Class D | 1921 |
| Northwest International League | British Columbia, Washington | Class B | 1919 |
| Northwestern League I | Illinois, Indiana, Iowa, Michigan, Minnesota, Ohio, Wisconsin | Independent | 1883–1884, 1886–1887 |
| Northwestern League II | British Columbia, Montana, Oregon, Washington | Class B | 1905–1917 |
| Oahu League | Hawaii, | Independent | 1913 |
| Ohio State League | Indiana, Kentucky, Michigan, Ohio, West Virginia | Independent (1887) Class D (1908–1916, 1936–1947) | 1887, 1908–1916, 1936–1947 |
| Ohio-Indiana League | Indiana, Ohio | Class D | 1948–1951 |
| Ohio-Pennsylvania League | Ohio, Pennsylvania, West Virginia | Class C (1905–1911) Class D (1912) | 1905–1912 |
| Ohio Valley League | Ohio, | Independent | 1890, 1912, 1949 |
| Oklahoma State League | Oklahoma | Class D | 1912, 1922–1924 |
| Oklahoma-Arkansas-Kansas League | Arkansas, Kansas, Oklahoma | Class D | 1907 |
| Oklahoma-Kansas League | Kansas, Oklahoma | Class D | 1908 |
| Ontario-Quebec-Vermont League | Ontario, Quebec, Vermont | Class B | 1924 |
| Oregon State League | Oregon, Washington (state) | Class D | 1904 |
| Pacific Coast International League | British Columbia, Washington | Class B | 1918–1922 |
| Pacific Interstate League | Oregon, Washington | Independent | 1891 |
| Pacific League | California | Independent | 1878-1880 |
| Pacific National League | California, Idaho, Montana, Oregon, Utah, Washington | Class A (1903) Class B (1904) Independent (1905) | 1903–1905 |
| Pacific Northwest League | British Columbia, Montana, Oregon, Utah, Washington | Independent (1890–1892, 1896, 1898, 1901) Class B (1902) | 1890–1892, 1896, 1898, 1901–1902 |
| Palmetto League | Georgia, South Carolina | Class D | 1931 |
| Pan American Association | Unknown | Independent | 1960 |
| Panhandle-Pecos Valley League | New Mexico, Texas | Class D | 1923 |
| Peninsula Winter League | California | Rookie | 1959–1968 |
| Pennsylvania League | Pennsylvania | Independent | 1903–1904 |
| Pennsylvania-Ohio-Maryland League (POW) | Maryland, Ohio, Pennsylvania, West Virginia | Class D | 1908–1914 |
| Pennsylvania-Ontario-New York League (PONY) | Ontario, Pennsylvania, New York | Class D | 1939–1956 |
| Pennsylvania-New Jersey League | New Jersey, Pennsylvania | Independent | 1908 |
| Pennsylvania State Association | Pennsylvania | Class D | 1934–1942 |
| Pennsylvania State League | Pennsylvania | Independent | 1892–1895 |
| Pennsylvania-West Virginia League | Pennsylvania, West Virginia | Class D | 1906–1907 |
| Pennyrile League | Kentucky | Independent | 1896 |
| Piedmont League | Maryland, North Carolina, Pennsylvania, South Carolina, Virginia | Class D (1920) Class C (1921–1931) Class B (1932–1955) | 1921–1955 |
| Potomac League | Maryland, West Virginia | Class D | 1916 |
| Prairie League | Manitoba, Minnesota, North Dakota, Saskatchewan, South Dakota, Wisconsin | Independent | 1995–1997 |
| Provincial League | Quebec, Vermont | Independent (1900, 1948–1949) Class C (1950–1955) | 1900, 1948–1955 |
| Rio Grande Association | Arizona, New Mexico, Texas | Class D | 1915 |
| Rio Grande Valley League | Texas | Class D (1931, 1949) Class C (1950) | 1931, 1949–1950 |
| Rocky Mountain League | Colorado, New Mexico, Wyoming | Class D | 1912 |
| San Francisco City League | California | Independent | 1896 |
| San Joaquin Valley League | California | Class D (1910) Independent (1911) | 1910–1911 |
| Sarasota Rookie League | Florida | Rookie | 1964 |
| Sooner State League | Oklahoma, Texas | Class D | 1947–1957 |
| Sophomore League | New Mexico, Texas | Class D | 1958–1961 |
| South Carolina League | South Carolina | Class D | 1906–1908 |
| South Central League | Arkansas, Oklahoma | Class D | 1906, 1912 |
| South Coast League | Georgia, Florida, South Carolina | Independent | 2007 |
| South Dakota League | Minnesota, North Dakota, South Dakota | Class D | 1920–1923 |
| South New Jersey League | New Jersey | Independent (1895, 1897) Class D (1896) | 1895–1897 |
| South Texas League | Texas | Class C | 1903–1906 |
| Southeastern League | Alabama, Florida, Georgia, Louisiana, North Carolina, Tennessee | Class D (1910–1912) Class B (1926–1950) Independent (2002–2003) | 1910–1912, 1926–1950, 2002–2003 |
| Southern Association | Alabama, Arkansas, Georgia, Louisiana, Tennessee | Class B (1886, 1892–1896, 1898, 1901) Class C (1899) Class A (1902–1945) Class AA (1946–1961) | 1886, 1892–1896, 1898–1899, 1901–1961 |
| Southern California League | California | Class D | 1913 |
| Southern California Trolley League | California | Class D | 1910 |
| Southern California Winter League | California | Winter | 1914, 1957 |
| Southern Illinois League | Illinois | Independent (1895–1896) Class D (1910) | 1895–1896, 1910 |
| Southern League of Colored Base Ballists | Alabama, Florida, Georgia, Louisiana, South Carolina, Tennessee | Negro minor | 1886 |
| Southern Michigan League | Michigan | Class D (1906–1910) Class C (1911–1912) | 1906–1912 |
| Southern New Hampshire League | New Hampshire | Class D | 1907 |
| Southern Tier League | New York, Pennsylvania | Independent | 1904–1905 |
| Southern Tri-State League | Alabama, Tennessee | Independent | 1905 |
| Southwest International League | Arizona, California, Mexico, Nevada, Texas | Class C | 1948–1951 |
| Southwest Iowa League | Iowa | Class D | 1903 |
| Southwest Texas League | Texas | Class D (1910–1911) Independent (1936) | 1910–1911, 1936 |
| Southwest Washington League | Washington | Class D | 1903–1906 |
| Southwestern League | Arkansas, Kansas, Missouri, Oklahoma | Independent (1887, 1904) Class D (1921, 1924–1926) Class C (1922–1923) | 1887, 1904, 1921–1926 |
| Southwestern Nebraska Baseball League | Nebraska | Independent | 1903 |
| Sunset League | Arizona, California, Mexico, Nevada | Class C | 1947–1950 |
| Tar Heel League | North Carolina | Class D | 1939–1940, 1953–1954 |
| Tennessee-Alabama League | Alabama, Tennessee | Independent | 1903–1904 |
| Texas Association | Texas | Class C (1896) Class D 1923–1926) | 1896, 1923–1926 |
| Texas Colored League | Louisiana, Oklahoma, Texas | Negro minor | 1919–1921, 1923–1926 |
| Texas-Louisiana Negro League | Louisiana, Texas | Negro minor | 1930–1931 |
| Texas–Oklahoma–Louisiana League | Louisiana, Oklahoma, Texas | Negro minor | 1929 |
| Texas-Oklahoma League | Oklahoma, Texas | Class D | 1911–1914, 1921–1922 |
| Texas-Southern League | Louisiana, Texas | Class B (1895) Class C (1896–1899) | 1895–1899 |
| Texas Valley League | Texas | Independent (1901–1908) Class D ( 1927–1928, 1938) | 1901–1908, 1927–1928, 1938 |
| Tidewater League | North Carolina, Virginia | Class D | 1911 |
| Tobacco State League | North Carolina | Class D | 1946–1950 |
| Tri State League | Alabama, Florida, Louisiana, Mississippi | Negro minor | 1935 |
| Tri-State League | Arkansas, Delaware, Illinois, Indiana, Iowa, Kentucky, Mississippi, Nebraska, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, South Dakota, Tennessee, West Virginia, Wisconsin | Independent (1887–1890, 1895, 1904–1906, 1938–1939) Class B (1907–1914, 1946–1955) Class D (1924–1926) | 1887–1890, 1895, 1904–1914, 1924–1926, 1938–1939, 1946–1955 |
| Twin Ports League | Minnesota, Wisconsin | Class E | 1943 |
| Twin States League | New Hampshire, Vermont | Class D | 1911 |
| Union Association | Idaho, Montana, Utah | Class D | 1911–1914 |
| Union Professional League | Delaware, Maryland, New Jersey, New York, Pennsylvania, Washington D.C. | Independent | 1908 |
| United States Baseball League | Illinois, New York, Ohio, Pennsylvania, Virginia, Washington D.C. | Independent | 1900, 1912–1913 |
| United States League | Illinois, Massachusetts, Michigan, Missouri, New Jersey, New York, Ohio, Pennsylvania | Negro minor | 1945–1946 |
| Upper Peninsula League | Michigan, Wisconsin | Independent | 1888, 1890–1891, 1895 |
| Utah-Idaho League | Idaho, Utah | Class C | 1926–1928 |
| Utah State League | Utah | Independent | 1902 |
| Vermont State League | New York, Vermont | Independent | 1907 |
| Virginia League | North Carolina, Virginia | Class C (1906–1919) Class B (1920–1928) | 1906–1928 |
| Virginia League I | Virginia | Independent (1894) Class B (1895–1896) | 1894–1896 |
| Virginia League II | Virginia | Class D | 1900 |
| Virginia League III | Virginia | Class D | 1939–1942 |
| Virginia League IV | North Carolina, Virginia | Class D | 1948–1951 |
| Virginia Mountain League | Virginia | Independent (1912 Class D (1914) | 1912, 1914 |
| Virginia-North Carolina League | North Carolina, Virginia | Class C (1901) Class D (1905) | 1901, 1905 |
| Virginia Valley League | Kentucky, Oregon, West Virginia | Class D | 1910 |
| Washington State League | Washington | Class D | 1910–1912 |
| West Coast Negro Baseball Association | California, Oregon, Washington | Negro minor | 1946 |
| West Dixie League | Louisiana, Texas | Class C | 1934–1935 |
| West Michigan League | Michigan | Class D | 1915 |
| West Texas League | Texas | Class D | 1920–1922, 1928–1929 |
| West Texas-New Mexico League | New Mexico, Texas | Class D (1937–1942) Class C (1946–1954) Class B (1955) | 1937–1942, 1946–1955 |
| West Virginia League | West Virginia | Class D | 1910 |
| Western Arkansas League | Arkansas | Class D (1924) | 1924 |
| Western Association | Arkansas, Colorado, Illinois, Indiana, Iowa, Kansas, Kentucky, Ohio, Oklahoma, Michigan, Minnesota, Missouri, Nebraska, Texas, West Virginia | Independent (1888–1891, 1893, 1894–1899) Class D (1911, 1914–1917, 1920–1921) Class C (1905–1910, 1922–1932, 1934–1954) | 1888–1891, 1893, 1894–1899, 1901, 1905–1911, 1914–1917, 1920–1932, 1934–1954 |
| Western Baseball League | Arizona, California, Oregon, Nevada, Utah | Independent | 1994–2002 |
| Western Canada League | Alberta, Manitoba, Saskatchewan | Class D (1907, 1910–1914) Class C (1919) Class B (1920–1921) Independent (1951–1961) | 1907, 1910–1914, 1919–1921, 1951–1961 |
| Western Carolina League | North Carolina | Class D | 1948–1952, 1960–1962 |
| Western Carolinas League | North Carolina, South Carolina | Class D (1948–1952; 1960–1962) Class A (1963–1979) | 1948–1952, 1960–1979 |
| Western International League | Idaho, Oregon, Washington, Alberta, British Columbia | Class B (1922, 1937–1942; 1946–1951) Class A (1952–1954) | 1922, 1937–1942, 1946–1954 |
| Western Interstate League | Indiana, Illinois, Pennsylvania | Independent (1883) Class B (1885) | 1883, 1895 |
| Western League I | Colorado, Indiana, Iowa, Kansas, Minnesota, Nebraska, Michigan, Ohio, New York, Wisconsin | Independent | 1885–1888, 1892–1899 |
| Western League II | Colorado, Iowa, Illinois, Kansas, Minnesota, Missouri, Nebraska, New Mexico, Oklahoma, Texas, Wisconsin | Class A | 1900–1937, 1947–1958 |
| Western League III | Colorado, Iowa, Minnesota, Nebraska, South Dakota, Wyoming | Class D | 1939–1941 |
| Western New York League | New York | Independent | 1890 |
| Western Ontario Baseball Association | Ontario | Class D | 1905 |
| Western Pennsylvania League | Maryland, Pennsylvania, West Virginia | Class D | 1907 |
| Western Tri-State League | Idaho, Oregon, Washington (state) | Class D | 1912–1914 |
| Wisconsin-Illinois League | Illinois, Wisconsin | Class D | 1908–1914, 1926-1927, 1932 |
| Wisconsin-Michigan League | Michigan, Wisconsin | Independent | 1892 |
| Wisconsin State League | Illinois, Wisconsin | Class D | 1905–1907, 1922-1925, 1928-1931, 1940-1942, 1946-1953 |
vteProfessional baseball leagues :