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Dzogchen is a teaching of the Nyingma school, so if I were you I would begin my search at Nyingma meditation centers, for example in Vancouver there's one called The Lotus Speech belonging to Northern Treasures Nyingma Lineage. They might know where to go next.
Kagyu lineage also has great teachers and they often have "double major" in Nyingma practices but not to the point of teaching Dzogchen, I don't think so. They do teach Mahamudra though which is similar enough that you could start there and eventually transfer to Nyingma.
What you are asking for is a very advanced teaching so be prepared for a long and arduous journey going through multiple intermediate stations.
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I'm not completely sure if this monastery is a Dzogchen monastery, but you can try the Thrangu Monastery in British Columbia, Canada.
This monastery belongs to the Kagyu lineage.
You can find a list of teachers here.
This wikipedia page on Thrangu Rinpoche states that he trained Dzogchen Ponlop Rinpoche.