Just surveillance cameras, I suppose? Including all cameras in homes, DIY, etc.?
Yes. It seems all the CCTV per capita statistics are for the UK (1 to 11, or 1 to 14, or 1 to 32), but I can't find anywhere statistics for Canada or the US.
And even those stats seem to be heavily politically motivated, with those for and against picking numbers to back their cause.
I think there are easily 50 million cameras in the US, maybe 100 million.
I am basing it on the number of business in the US - which is 6 to 7 million total (only counting business with employees). Clearly, most have surveillance cameras, as the price has plunged over the last 5 years, with Costco / big box retailers becoming sizeable players. And, of course, there are big businesses, with thousands or tens of thousands of cameras. That's why I think 50 million easily.
I'd guess maybe 1 surveillance camera for every 3 or 4 people.