Peterhead (About this sound listen ; Scottish Gaelic: Ceann Phàdraig, Scots: Peterheid About this sound listen ) is a town in Aberdeenshire, Scotland. It is Aberdeenshire's biggest settlement (the city of Aberdeen itself not being a part of the district), with a population of 18,537 at the 2011 Census.Peterhead sits at the easternmost point in mainland Scotland.