They will now face Meath in the next round.
A five star performance saw Westmeath secure their place in the quarter finals of the Leinster Football Championship.
The Lake County scored five first half goals as they sealed a comfortable 5-25 to 1-16 win away to Longford in Pearse Park.
Luke Loughlin and Brandon Kelly scored two goals each, with Shane Corcoran ending the game with 1-4.
Mark McHugh's side will now face Division Two winners Meath for a spot in the final four this weekend.
He says he didn't expect the game to pan out the way it did:
Mark McHugh spoke to the media after the game:
Our coverage of Westmeath against Longford in the Leinster Senior Football Championship is with thanks to Keenan Bauer Motors Mullingar. Your home for Citroen and Honda in the Midlands. Keenanbauer.com
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