Many references to places and persons in Wigtownshire are to be found in the searchable Records of the Parliaments of Scotland to 1707.
Local government records for the whole of the county of Wigtown are held at the Dunfries & Galloway Archive Centre - see Archives above. Brief details of the records here.
Records of the former burghs are held at Stranraer Museum, and the National Records of Scotland, Edinburgh. Details will be found on the parish pages.
The Dumfries & Galloway Council website has further information concerning present-day local government - including Registration, Archives, Cemeteries, etc.