This little tool is quite interesting :-
https://your-family-history.com/Hence, the surname TIMMS is often from Warwickshire and Oxfordshire, GUNN from Nottinghamshire, GREENWOOD is Lancashire and Yorkshire (and particularly the Pennine towns and villages) and so on.
There was a detailed mapping tool produced for the 1881 census, but if I remember correctly, that only worked with the index and transcription on CD.