The Ontario Genealogical Society has Indexed the Ontario portion of the
1871 Census,
and the names and some particulars about the various
Heads of Households and other 'unconnected' or Stray people that were
enumerated in the Province in the spring of 1871 are
searchable through National Archives files.

Click here to access the entire 1871 Census (Ontario) Index database.
An introduction to the database, with links to the search engine is located here.

These pages contain all of the information neccessary to locate individuals
on specific reels of National Archive microfilm.
These films are available through Inter-Library Loan.

The Kingston Branch of the OGS has published
Indices and Transcriptions of several local Census records.
Please see their Publications List for the full list of titles available to purchase.

In addition to the National Archives holdings,
The Government Documents Unit at Queen's University in Kingston
holds a complete set of all available Canadian Census returns.
The microfilm reels are in open cabinets (but are not available through ILL)

Queen's University Documents Unit has an absolutely stunning scanned image
of an original map showing Census Enumeration Districts of Ontario, 1871:.
Frontenac County was contained in three different Enumeration Districts
- 64 (Addington), 65 (Frontenac), and 66 (City of Kingston).