Blackhill, a quoad sacra parish, formed in 1878, mainly out of Peterhead parish, Aberdeenshire, its church being 4 miles SW by W of Peterhead town. Its central point is a hill of its own name, on the mutual border of Peterhead, Longside, and Cruden parishes, which, rising 374 feet above sea-level, was formerly deemed so worthless as to defy improvement; but now is nearly all under the plough, and also yields, in an extensive quarry, large blocks of excellent syenite, of the kind called popularly Peterhead granite. A public school, with accommodation for 80 children, had (1879) an average attendance of 43, and a grant of £34,17s.

(F.H. Groome, Ordnance Gazetteer of Scotland (1882-4); © 2004 Gazetteer for Scotland)