[2][4][5] In 1984–85 Mervue United first came to national prominence when they became the first CSL club to take part in the FAI Cup, losing 2–1 in the first round to the holders, UCD.

In 1997–98 Mervue United made a third appearance in the FAI Cup but were knocked out in the first round after a replay by Sligo Rovers.

As the highest placed non-reserve team in the league's inaugural season, Mervue United qualified for a relegation/promotion play-off.

[10][11][12] The O'Connor Report had also recommended reforming the Connacht Senior League, allowing Mervue United and Salthill Devon to play at a provincial level.

[13] However, in June 2013 the Connacht Tribune reported that the plans for a reformed CSL were shelved due to a lack of sufficient interest from the clubs.

[14] The senior teams of Mervue United and Salthill Devon subsequently joined the Galway & District League.

After joining the Connacht Senior League, the club secured a lease on a clubhouse and a pitch in Fahy's Field.

The move away from their Mervue fan base affected attendances to the degree that they were the lowest in league records.

In early 2011 Fahy's Field was upgraded with fencing and turnstiles been added, allowing Mervue United to play their later League of Ireland games there.