Westport United was formed in 1911 and is one of the oldest association football clubs in both County Mayo and Connacht.

On one occasion Harold Sloan, a leading Bohemians player and Ireland international, planted a tree in recognition of the two clubs' friendship.

[4] During its early years Westport United played in a local town based league and also entered the IFA Junior Cup.

[5][6] In 1954 Westport Town, Barcastle, Quay Hearts and Castlebar Celtic became the founder members of the Mayo Association Football League.

One of the reasons for Westport United's success during era was because they regularly borrowed players from Derry City.

Following an objection from Galway Bohemians, the Mayo League intervened in 1972–73 and ordered Westport United to field an all-local team for that season.

However it later emerged that Carew Park had fielded a suspended player and the FAI ordered the tie be replayed.

The final was played at Buckley Park on 19 June 2005 and Westport defeated Waterford Crystal 2–0 to win the cup.

[8] In 2013 the club began developing a new site on the grounds of Westport House and it was opened on 25 September 2016 and it is called United Park.

The grant was allocated by Michael Ring, Minister of State at the Department of Transport, Tourism and Sport, who also represents Mayo in Dáil Éireann.