Here's a screenshot of what they show:
Pardon me for being a [BLEEP], but could I bother you for a link to that?
(Grew up outside of Chicago and between that, 'Nam and the past twenty years, I just don't take much of anything on faith...that doesn't come from the Lord.)
It's on Ancestry.com, so unless you have a subscription, I don't think you'd be able to see it.
Here's what it says about the sources of the records:
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What types of public records have been utilized to create the U.S. Public Records Index?
• White pages
• Directory assistance records
• Marketing lists
• Postal change-of-address forms
• Public record filings
• Historical residential records
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I know, that's pretty general. But they list me, too, and it's accurate.)