In 2017, members of the Cobourg Museum Foundation undertook to create a map of Cobourg as it would have been in 1867. But it was not just a paper map but a 3D model. It was on display for a short while in the lobby of Victoria Hall - below is a photo of it taken at that time. It is planned to feature it from time to time at the Sifton-Cooke Heritage centre which is operated by the Museum Foundation.
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For Genealogists
There is quite a bit of Information for genealogists on this site - it is best accessed using the search feature above. Note that I have almost zero additional information - it is all on the web site. If you contact me, I will be polite but I don’t have any additional information. The best additional source of info for researchers is at the Cobourg Library where they have a local history room stocked with many historical books and documents. They do have some photos on-line but not much more - you need to visit.
A good source of information is the Northumberland County Archives. Contact the archivist Abigail Miller by email here or County Web site here.