[1] The ten founding members in 1964–65 included Home Farm, Bray Wanderers, Athlone Town, Shamrock Rovers B plus the reserve teams of Shelbourne, Bohemians, St Patrick's Athletic, Dundalk, Drumcondra and Drogheda.

In the 1977–78 season Dalkey United were due to travel to Dundalk to play in the quarter-final of the Blackthorn Trophy.

Dalkey United agreed and Dundalk subsequently informed the league the match was cancelled.

The club informed the league that the quarter-final against Dundalk had not been played, only to be told that the semi-finals were going ahead regardless.

Dalkey United opted to take legal action and the case was heading for the High Court when the league decided to declare semi-final results null and void.

After winning the rescheduled quarter-final against Dundalk, Dalkey United then won the semi-final and went on to defeat Bohemians in the final at Dalymount Park.

Having won the Blackthorn Trophy for a third time in a row, Dalkey United resigned from the league immediately afterwards and never applied to rejoin.

Other teams in the B Division this season included Dublin University, Monaghan United, Longford Town, St Brendan's, Belgrove, Shamrock Rovers B and the reserve teams of Waterford United, Dundalk, Shelbourne, Drogheda, St Patrick's Athletic, Bohemians and UCD.

The Athlone Town team included Fran Hitchcock, John Caulfield and Turlough O'Connor, who was their highest goalscorer.