Nobody is truly gonna be able to answer this unless they work for a said company. I do know there are paid services that give a hell of alot more info than say google does. I personally believe state id, utilities and credit agencys share information. Legal or not.
it just seems like the data is usually horribly inaccurate, from what i can tell they mix and match similar names until they profile has more data, so you may or may not get accurate data. I dont think they add state id stuff, i think its more voter rolls, and public data like ownership history
I think its all that, for instance I can find my current address if I even just use a search engine. Nothing is in my name here except my DL. Well and package shipments, which just goes to show how all info is shared. Voter roles is state.
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