- For the Roman Catholic Bishop of Hartford, see Lawrence Stephen McMahon.
McMahon was first elected to Dáil Éireann at a by-election in 1970 in the Dublin County South constituency, and held the seat at the 1973 general election. At the 1977 general election, he was returned for Dublin County Mid, and after a further revision of constituency boundaries, he was elected as TD for Dublin South-West at the general elections in 1981 and February 1982. He lost his seat at the November 1982 general election.
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