Internet users per household

I'm looking for data that would help estimate the number of Internet users per household (or, rather, "per Internet-connected household") in the United States.

If you perform a web search for "Internet users per household", you get a bunch of sites -- all of which are addressing this question in a country other than the United States.

Isn't this the sort of information our government should track in some way? There's a bill that wants to mandate a study of applying net neutrality regulations to high-speed Internet access services, but we don't know how to count Internet users per household.

Somebody help me!