Sitting Mayor of Athlone Gabrielle McFadden is leading the way in Longford Westmeath.
It was the death of her sister Nicky that sparked the by-election.
Her main competitor is seen as Aengus O'Rourke - the son of Mary O'Rourke and a cousin of the late Brian Lenhihan.
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In this tally, he's in second position at 19%.
Voter turnout: 45%
LONGFORD WESTMEATH TALLY:
54% of boxes open from Ballymahon, Granard, Longford Town, Athlone, Mullingar, Coole, Mullingar and Kilbeggan.
Fagan NP 4%
HOGAN SF 14%
JACKSON NP 1%
LEONARD LAB 3%
MCFADDAN FG 26%
MCNAMARA NP 3%
MORAN NP 15%
MORGAN NP 15%
O'ROURKE FF 19%