Blair County League was an Independent League that was based in Pennsylvania 1921 - Atoona, Bellwood, Claysburg, East Freedom, Roaring Spring, Williamsburg
1922 - Altoona, Bellwood, Claysburg, Duncansville, East Freedom, Hollidayspring, Roaring Spring, Williamsburg
1923 - No teams enter or Left the League
1924 - Claysburg, Duncansville, East Freedom, Hollidayspring, Roaring Spring, Williamsburg
1925 - Claysburg, Duncansville, Hollidayspring, Martinsburg, Roaring Springs, Sproul
1926 - Altoona, Claysburg, Duncansville, Hollidayspring, Roaring Springs, Williamsburg
1927 - No teams enter or Left the League
1928 - Claysburg, Duncansville, Penn Central, Roaring Springs, Shaffer Stores, Tyrone, Williamsburg
1929 - Bellwood enter the League and Penn Central and Tyrone has left the League
1930 - Martinsburg has enter the League and Bellwood, has left the League
1931 - No teams enter or Left the League
1932 - Hollidaysburg has enter the League and Penn Central has left the League
1933-1940 No teams enter or Left the League
1941 - Bellwood and Tyrone has enter the League
1942 - No teams enter or Left the League
1943 - No teams enter or Left the League