How many companies offer internships longer than a summer? I have a co-op position for this summer but after my 3rd year I'm hoping to get something longer, a 1

How many companies offer internships longer than a summer? I have a co-op position for this summer but after my 3rd year I'm hoping to get something longer, a 12 or 16 month position. Also -- are many American companies friendly towards Canadians who happen to have dual citizenship? To be honest ideally I'd work in Waterloo or Toronto (both are driving distance, ish, from my home) but I'd love to spend time in NYC or the Bay Area too.