In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Broadmayne like this:
BROADMAYNE, or Broadmoigne, a parish in Dorchester district, Dorset; 2 miles S of the Southwestern railway, and 4 SE of Dorchester. It has a post office under Dorchester. Acres, 2,540. Real property, £1,902. Pop., 506. Houses, 97. The property is much subdivided. The living is a rectory, annexed to the rectory of West Knighton, in the diocese of Salisbury. The church is not good.
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 Broadmayne has changed, please see our redistricted information for the modern district of West Dorset. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Broadmayne and units named after it.
GB Historical GIS / University of Portsmouth, History of Broadmayne in West Dorset | Map and description, A Vision of Britain through Time.
Date accessed: 30th May 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 "Broadmayne".