I know there are more…but here are a few off the top of my head!
Happy submitting!
The Writer’s Union of Canada Postcard Contest
250 words
Mail out by Feb. 14th
http://www.writersunion.ca/cn_postcard.asp
Geist Postcard Contest
Create a postcard
Write up to 500 words
Send by Feb. 15th
http://www.geist.com/blogs/contest/8th-annual-geist-literal-literary-postcard-sotyr-contest
Toronto Star Short Story Contest
Up to 2,500 words
Short Bio
Mail by Feb.25th
VANESSA SHIELDS 