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Tough question. Common names for panfish can get confusing. I did a Google search for "warmouth" and I'm even more confused than I was before.
If you mean Lepomis gulosus. Here's a map of their range.
http://nas.er.usgs.gov/queries/facts...?SpeciesID=376
I'm not sure I've ever seen one of those.
If you mean the Rock Bass (Ambloplites rupestris, Ambloplites constellatus) they are all over. They attach themselves to every bait and lure in the evening in the Delaware River. I also catch a lot of them at Merrill Creek Reservoir, especially around the rip rap dams.
http://en.wikipedia.org/wiki/Rock_bass
