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Can anyone recommend a good source for data like this? (paid, free, or otherwise) I know of a few companies myself, but would love to get some recommendations!
You could try a mailing list database that would have the name, category, phone, website, e-mail, address etc that are cheaper (make sure you check their site out to make sure they are legit) and you will almost certainly have to dedupe the content as there will be duplicate entries.
Some of these sites get their information by spidering other sites. Where they get their info and how they do it legally is something I have been trying to figure out for a while.
from what i understand, a lot of these data companies get their data from a variety of sources - and i would guess some of them are a little shady.
i'll keep shopping around and investigating for something that is accurate, ethical, and affordable. hopefully i can find that. ;)
A one-time dump of data would get more and more inaccurate over time unfortunately...but it is possible to allow website users report/change inaccuracies etc.. rather than pay for updates? (Yelp seems to do a reasonable job of that) But again, that would be a bit tricky too.
No promotional - just wanted to state that we do have a non-commercial database (minus phone #s + lat/lng coordinates). You are more than welcome to download the data and 'try it out' before you buy.
Oh and its 40k for the full US, not 50 :)
[edited by: AhmedF at 9:38 pm (utc) on Sep. 24, 2007]