I think Thorin's people left the Blue Mountains after Erebor was recaptured, so those lived at Erebor at the time of the War of the Ring. As I don't recall having read that the Dwarves of the Iron Mountains left their home to live at Erebor (I think even, that the Hobbit tells they left for their homes again after the Battle of the Five Armies), I think they still lived there. Of the other four Dwarven cities, I don't know a thing [img]smilies/smile.gif[/img]
As can be read in the LotR, some Dwarves tried to conquer Moria again after the recapture of Erebor, but failed. I don't know whether Moria was re-inhabited after the War of the Ring. Maybe other members of the BD know.
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