JeffreyM Donaldson is the Member of Parliament for the constituency of Lagan Valley which has an electorate size of 75,735 voters. This constituency is 3.49% smaller than the average electorate size, which is 73,181. Lagan Valley is in the ceremonial county of Armagh City, Banbridge and Craigavon; Lisburn and Castlereagh; Newry, Mourne and Down, part of the Northern Ireland region.