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The standard range is given as 3km, but have been observed far further out than that at times. Given that they communicate to each other where food sources are, they can efficiently harvest for a long way off. It's also surprising where hives are and you can quite easily hide one away such that it's not easily noticed by neighbours - an entrance facing a high fence or wall forces them to fly way up before moving horizontally.

I have no idea how common it is in the States but poking about suggests that here in NZ there are about half a million hives. There are about 5550 total beekeeping enterprises in New Zealand, of which only 803 were commercial. Anything less that 50 hives was considered hobbyist.