That is a tough one, because the most recent census available to the public is that of 1911. I would think your best bet would be to place a query in the newsletter of the London & Middlesex Genealogical Society. It is a branch of the Ontario Genealogical Society whose website is: www.ogs.on.ca
The library of the branch has a good collection of information on London settlers.
I sympathize with you and your quest. Good luck.