In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Primrose Hill like this:
PRIMROSE-HILL, an eminence in the N W of the metropolis; adjacent to the N W side of Regent's park, 3½ miles N W by N of St. Paul's. It is pierced through the N skirt, by a tunnel of the Northwestern railway, 3, 360 feet long; and it adjoins, on the S, Barrow hill, with the West Middlesex reservoir. P.-hill was the scene of the murder of Sir E. God frey in 1678.
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 Primrose Hill has changed, please see our redistricted information for the modern district of Camden. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Primrose Hill and units named after it.
GB Historical GIS / University of Portsmouth, History of Primrose Hill, in Camden and Middlesex | Map and description, A Vision of Britain through Time.
Date accessed: 09th December 2013
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Primrose Hill".