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Census Information
The 1871 Ontario Census can be found online, provided free by the Library & Archives Canada (Head of Household only).
The 1881 Canadian Census can be found online, free, at Familysearch.org
The 1901 Canadian Census can be found free at automatedgenealogy.com
The 1911 Canadian Census can be found free at automatedgenealogy.com

The following censuses should be availble through your local library or The Ontario GenWeb Official Census Project
is working to put transcriptions on line. Please check for the latest additions.
Ontario Censuses are available for the following years for Prescott County.
1851 - listing of all family members. Reel# C-11749 Completed by 12 January 1852.   
* Portions of the 1851 census have not survived.
1861 - listing of all family members. Reel# C-1068 Completed by 14 January 1861.
1871 - listing of all family members. Reel# C10010-10011 Completed by 2 April 1871.
Index of heads of families is on line and searchable. See link above.
1881 - listing of all family members. Reel# C-13228 Completed by 4 April 1881.
1891 - listing of all family members. Reel# T-6364 Completed by 6 April 1891.
* Institutions were enumerated separately in one block and appear on reel T-6427.
1901 - listing of all family members. Reel# T-6463. Completed by 31 March 1901.

Additional Resources:
1851 Censuses for Prescott Townships from Census Online (links back to OntarioGenWeb)

From the Library & Archives site, here is a list by town(ship) of available censuses:

Alfred - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10011
1881 C-13228
1891 T-6364
1901 T-6492

Caledonia - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10011
1881 C-13228
1891 T-6364
1901 T-6492

Hawkesbury (East) - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10010
1881 C-13228
1891 T-6364
1901 T-6492

Hawkesbury (West) - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10010
1881 C-13228
1891 T-6364
1901 T-6492

Hawkesbury (Town) - PRESCOTT COUNTY  ONT
1901 T-6492

Hawkesbury (Village) - PRESCOTT COUNTY  ONT
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10010 - C-10011
1881 C-13228
1891 T-6364

Institutions - PRESCOTT COUNTY  ONT
1891 T-6427

Longueuil - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10011
1881 C-13228
1891 T-6364
1901 T-6492

L'Orignal (Village) - PRESCOTT COUNTY  ONT
1881 C-13228
1891 T-6364
1901 T-6492

Plantagenet (North) - PRESCOTT COUNTY  ONT
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10011
1881 C-13228
1891 T-6364
1901 T-6492

Plantagenet (South) - PRESCOTT COUNTY  ONT
1851 C-11749 Agricultural census missing
1861 C-1068 Nominal
1861 C-1068 Agricultural
1871 C-10011
1881 C-13228
1891 T-6364
1901 T-6493

PRESCOTT COUNTY  ONT
1842 C-1344
1851 C-11749
1861 C-1068
1871 C-10010 - C-10011
1881 C-13228
1891 T-6364
1891 T-6427 Institutions
1901 T-6492 - T-6493

Vankleek Hill (Village) - PRESCOTT COUNTY  ONT
1901 T-6492

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