Sinn Féin An election to Leitrim County Council took place on 31 May 1920 as part of that year's Irish local elections.

19 councillors were elected from 5 electoral divisions by PR-STV voting for a five-year term of office.

Sinn Féin won every seat for election.

The large majority of seats were uncontested, although in Manorhamilton, where seats were contested, Sinn Féin won a massive majority of the votes and as such still secured every seat.

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