Dear Shannon

Found your desired name, but with different date of birth, in this database:
Federal Census of 1871 (Ontario Index): http://www.archives.ca/02/02010802_e.html

Name Age Birthplace District Sub-district

MCQUAID , WILLIAM A 33 ONTARIO, NORTHUMBERLAND EAST, Percy
[Calculate date of birth: about 1838.]

Hope this leads to progress with your research.

Ruth