Hi, Contact the Public Library for Port Arthur Ontario - They may have city directories - on microfilm - may hold old telephone directories - .
http://www.tbpl.ca/article/collections-352.aspHave you searched the 1921 Canada Census - your GGrandfather may be listed
City Archive for Port Arthur - may hold Property tax records - Voters Lists - etc
Enlistment papers should be correct ! Have you obtained your grandfathers Service Records
They may be available for a small fee - Can be very interesting - Well worth the fee .
Searching current Online White Pages Directory 411.ca - for the CORPITUCK surname Nationwide Canada finds 0 listings.
Mike CORPITUCK
https://livesofthefirstworldwar.org/lifestory/5594424http://boards.ancestry.com/thread.aspx?mv=flat&m=230&...