In 1887, John Bartholomew's Gazetteer of the British Isles described Twynholm like this:
Twynholm, par. and vil., Kirkcudbrightshire - par., 10,484 ac., pop. 681; vil., 3 miles NW. of Kirkcudbright; P.O.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Twynholm has changed, please see our redistricted information for the modern district of Dumfries and Galloway. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Twynholm and units named after it.
GB Historical GIS / University of Portsmouth, History of Twynholm, in Dumfries and Galloway and Kirkcudbrightshire | Map and description, A Vision of Britain through Time.
Date accessed: 26th January 2015
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Twynholm".