Twelve Counties currently participate in the Senior Championship following the promotion of Intermediate champions Down at the end of the 2020 season.

These are Clare, Cork, Down, Dublin, Galway, Kilkenny, Limerick, Offaly, Tipperary, Waterford, Westmeath and Wexford.

[3] The counties participate in a group series with the top teams progressing to the knock-out stages.

Following the withdrawal of Connacht from the inter-provincial senior semi-finals the competition changed to an open-draw knockout system in 1974.

Two years later in 1957 Dublin began another great run of success which ended in 1966 with the capturing of their tenth consecutive All-Ireland title.

Three counties, Kildare (1933), Cavan (1940 and 1941) and Clare (1944, and 1978) have contested the All-Ireland semi-final without qualifying for a final.