Which real-life cities have inspired the major cities of GTA?

Rockstar Games knew they had an absolute goldmine on their hands with GTA 3 and its expansive open world.

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I'm hoping to see multiple larger cities. Gta 5 had Los Santos and a series of tiny towns spread across the map and I think it made those towns essentially useless.

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Which real-life cities have inspired the major cities of GTA?

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