How do TV networks find out their ratings?

Where can I find TV ratings by geographic area?

I have found ratings that aggregate the whole country (estimated number of viewers per show). Where can I get more granular data? I often hear things like "top rated in so-and-so age group" but where can I find that data? Most of all, I'm interested in the ratings per geographic area. For example, the number of viewers of a certain show in the SF Bay Area.
Answer:

Obviously because Neilsen makes money on this data, that is their reason for existence. Why would they give this info away for free?

Matt Ackeret at Quora Visit the source

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