A result in the Fermanagh and south Tyrone, Westminster election is not expected until 5am on Friday morning.
Michelle Gildernew of Sinn Fein is hoping to retain the seat and see off the challenge of Ulster Unionist Tom Elliott who was selected as part of a unionist pact.
John Coyle is standing for the SDLP, Hannah Su for Alliance and Tanya Jones for the Green Party.
Follow @Tyronetimes on Twitter for all the latest from the count centre in Omagh and the hashtag #ge2015NI.
In 2010 Sinn Fein’s Michelle Gildernew retained her Fermanagh and South Tyrone seat by just four votes from agreed unionist candidate Rodney Connor after a series of recounts.