1923 saw the club win the Louth Senior Football Championship by defeating Boyne Rangers of Drogheda, captained by inter-county player Peter Garland.

In 1933 the club lost the Louth Senior Football Championship final for the first time, going down 3–03 to 1–07 against Newtown Blues at the Drogheda Gaelic Grounds, with a team that featured five Hearty brothers.

[5] The club's new home ground Clan na Gael Park was officially opened in 1966, coinciding with 50th anniversary celebrations.

This side contained Jim Brady, Aidan Wiseman, Gary O'Callaghan and the McKeever brothers who all went on to win SFC titles in the 1980s.

[12] The next few years saw Clan na Gael lose three county finals in a row, all narrowly, to opponents Newtown Blues (1988),[5] Cooley Kickhams (1990)[13] and Stabannon Parnells in 1991.

[14] Only a late equalizing point from the boot of Séamus O'Hanlon prevented a fourth straight county final defeat, against town rivals Dundalk Gaels in 1992.

[21] The club reached their last Senior championship semi-final to date in 2004, losing to eventual winners St Patrick's on a scoreline of 0–08 to 0–06.

[30] In 2004, the County Board honoured the club by choosing Clan na Gael park as the venue for that year's Louth Senior Football Championship final, for the first time since their foundation in 1916.

The club's main local rivals are cross-town neighbours Dundalk Gaels - whom they beat in the 1992 Louth SFC final replay[32] - and Seán O'Mahony's.