1325 at Pats v Longford, as announced over the PA. All the clubs have to have their attendances notified to the FAI by half time, there's no reason why they can't announce the figures at the end of the match.
Someone mentioned 3000 for Derry v Pats. I reckon that's pushing it a bit, 2500 would be nearer the mark, unless that new mini-stand was totally jointed.