Canadian Province Codes,
"The TransBorder Freight Dataset uses an assigned code to represent Canadian provinces, as shown below. These do not correspond to provincial mail codes used by the Canadian government. Please note that in April 1999, a new territory, Nunavut, was established in Canada. In addition, these codes are available at http://www.bts.gov/ntda/tbscd/can-prov.html",
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Province,Code
Alberta,XA
British Columbia,XC
Manitoba,XM 
New Brunswick,XB
Newfoundland,XW
Northwest Territories,XT
Nova Scotia,XN
Ontario ,XO
Prince Edward Island,XP
Quebec,XQ
Saskatchewan,XS
Nunavut,XV
Yukon Territory,XY
Province Unknown,OT