Northumberland County GenWeb
The following provide census records for Northumberland County.
1901 Census Transcriptions For Northumberland County at AutomatedGenealogy.com
Automated Genealogy is hosting a project to allow volunteers to contribute to a free index to the 1901 census based on the images from the National Archives. Access is free and includes surname indices and links to images of the original census forms.
1901 Census Images at the National Archives of Canada
The National Archives of Canada provide free online access to images of the original 1901 census records.
Census from Nelson Parish 1861 from the book entitled Nelson and its Neighbors by Earl J. English
Ancestry.com has 1901 Census transcriptions for Northumberland County but you must be a paying customer to access them.