These are on networks with enough TV's showing games getting enough viewership to actually be reported by Nielsen publicly.
I know that even lower level TV stations and even shows/games with less viewership than what is considered publicly re-portable do have numbers but how to get a hold of them with out paying for in depth Nielsen ratings is the question. I'm not willing to pay for that when it is likely insignificant to begin with. And no I wouldn't think of doing a public records request like little brother.