The following announcement was written by the folks at Findmypast:
The Canada Census of 1881 records the details of over 4.2 million Canadians. In 1881, Canada consisted of British Columbia, Manitoba, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, and Quebec. The census began on 4 April 1881 and covered 192 districts broken up into 2,139 sub-districts. Census districts and sub-districts were composed of cities, towns, townships, Indian reserves, and less-defined areas. Areas that were less defined posed a particular challenge to enumerators and resulted in individuals being missed. This was particularly the case for Aboriginal people living in districts 187 (New Westminster, British Columbia) and 192 (Northwest Territories).