In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Tarrant Monkton like this:
TARRANT-MONCKTON, a parish in Blandford district, Dorset; 4 miles NE by E of Blandford r. station. Post town, Blandford. Real property, £1,594. Pop., 243. Houses, 55. The living is a vicarage, united with T.-L., in the diocese of Salisbury. Value, £120. Patron, J. J. Farquharson, Esq.
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 Tarrant Monkton has changed, please see our redistricted information for the modern district of North Dorset. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Tarrant Monkton and units named after it.
GB Historical GIS / University of Portsmouth, History of Tarrant Monkton in North Dorset | Map and description, A Vision of Britain through Time.
Date accessed: 12th March 2014
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Tarrant Monkton".