Mayo becomes a five-seater with the return of the Ballinrobe hinterland from Galway West.
Between 1923 and 1969, the constituency was divided into two constituencues, Mayo North and Mayo South.
Mayo North was one of the five constituencies that returned a rump Sinn Féin candidate in June 1927. It also hosted Republican Tom Maguire (1921 until 1927) who in 1986 gave his blessing to Republican Sinn Fein in the aftermath of the Republican schism of that year; he died in 1993 at the age of 101.
Fianna Fáil held two out of three seats from 1937 until 1951 when Thomas O’Hara took a seat for Clann Na Talmhan on his third attempt. He held it in 1954 but lost in 1957 – he then won as a Fine Gael TD in 1965 and 1969 (for Mayo East). Joseph Leneghan ran unsuccessfully for Fine Gael in 1944 and 1951 before winning a seat in as an Independent in 1961 – he lost in 1965 but was elected again in 1969 this time for Fianna Fáil. In 1965 Fine Gael took two out of three seats for the first time; they took 49% just behind Fianna Fáil on 49.7%.
In Mayo South, Cumann na nGaedhal won three out of seats in 1923 – they lost one to Thomas O’Connell of Labour in June 1927 who topped the poll. In 1933 the first four candidates on the first count were Fianna Fáil, and the other four were Fine Gael. Between 1932 and 1943 the result was three seats for Fianna Fáil and two seats for Fine Gael – this pattern was broken in the latter year by the emergence of Clann Na Talmhan who won two seats. Fine Gael lost their seat in 1944, and failed to regain it until Henry Kenny (father of Enda) won it back for them.
In 1969 two new three seat constituencies of Mayo East and Mayo West were introduced. Fine Gael won two seats that year in Mayo East, and in 1973 won two seats in Mayo West – despite Fianna Fáil winning over half the vote. Otherwise each constituency returned two Fianna Fáil and one Fine Gael TDs until their abolition after 1992.
Fine Gael were dominant in the new five seat constituency winning three seats in 1997 and 2007 and four seats in 2011.
THE BIGGEST PARTIES PER DED IN 2020

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