I'm applying to a couple on campus jobs and I was just wondering... I will be living on campus this year and I don't know what I should write on my cover letter/resume. Should I write my home address or do I write something about living at Mac? I wrote in the letter that I'm living in residence, but I'm writing out my contact info and I don't know what to write.

You can find a list of the residences here:
http://housing.mcmaster.ca/Residence...Buildings.html
If you click on one, down at the bottom it lists the mailing address for the buildings. I'd just put the residence as my address, but I don't think it would be a problem either for you to put your home address.