In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described St Mary Hill like this:
MARY-HILL (ST.), a parish in Bridgend district, Glamorgan; on the river Ogmore, near the South Wales railway, 3¼ miles E of Bridgend. It contains the hamlet of Rythin; and its Post town is Cowbridge. Acres, 1,404. Real property, £933. Pop., 252. Houses, 48. The property is all in one estate. The living is a vicarage in the diocese of Llandaff. Value, £90. Patron, Sir T. D. Aubrey, Bart. The church is good; and there are charities £4. A cattle fair is held on 26 Aug.
St Mary Hill is now part of The Vale of Glamorgan district. Click here for graphs and data of how The Vale of Glamorgan has changed over two centuries. For statistics about St Mary Hill itself, go to Units and Statistics.
GB Historical GIS / University of Portsmouth, History of St Mary Hill in The Vale of Glamorgan | Map and description, A Vision of Britain through Time.
Date accessed: 30th March 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " St Mary Hill ".