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If you peruse the Partners in Flight landbird population database, you can find out how many individuals of a certain species are estimated to be in North America. How about Red-winged Blackbird? 190,000,000 (and that's less than there were a few decades ago, when they were the continent's most abundant species). How about some other common species?
American Robin: 310,000,000
Black-capped Chickadee: 34,000,000
What about some declining species?
Cerulean Warbler: 560,000
Golden-winged Warbler (with a much smaller geographic range): 210,000
If you're interested and want to query the database yourself, go to this page, and read the how-to.
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