B

The B classification existed as a way to rank minor leagues from 1902 (the start of the classification system) through 1962. Leagues to hold that classification were the following:

• Big State League 1947-1957
• Canadian League 1914-1915
• Carolina League 1949-1962
• Central League 1903-1917, 1920-1922, 1928-1930, 1932, 1934
• Colonial League 1947-1950
• Connecticut League 1905-1912
• Eastern Association 1913-1914
• Eastern Canada League 1922-1923
• Eastern League 1916-1918
• Florida International League 1949-1954
• Gulf Coast League 1951-1953
• Interstate League 1940-1952
• Michigan-Ontario League 1919-1926
• Mississippi Valley League 1933
• New England League 1902-1915, 1919, 1926-1930, 1933, 1946-1949
• New York-Pennsylvania League 1923-1932
• New York State League 1902-1917
• Northeastern League 1934
• Northwestern League 1905-1917
• Northwest League 1955-1962
• Northwest International League 1919
• Pacific Coast International League 1918, 1920-1921
• Pacific National League 1904
• Pacific Northwest League 1902
• Piedmont League 1932-1955
• Quebec-Ontario-Vermont League 1924
• Quebec Provincial League 1940
• South Atlantic League 1921-1930, 1936-1942
• Southeastern League 1926-1930, 1932, 1937-1942, 1946-1950
• Southern Association 1902-1904
• Southwestern League 1956-1957
• Texas League 1911-1920
• Three-I League 1902-1917, 1919-1932, 1935, 1937-1942, 1946-1961
• Tri-State League (PA-DE-NJ) 1907-1914
• Tri-State League (NC-SC-TN) 1946-1955
• Virginia League 1920-1928
• West Texas-New Mexico League 1955
• Western Canada League 1920-1921
• Western International League 1922, 1937-1942, 1946-1951