Throwing off a few "Cities" here only since that's what Vanilla uses already.
Scientific; SiliconValley, Area51, Boston, Reykjavik, Edinburgh, Venice, Cape Canaveral, Baikonour, Kourou,
Industrial; Detroit, SaoPaulo, Warsaw,
Agricultural; Regina, Kobe,
Diplomatic; Strasbourg, Vatican, New York,
Financial; Nassau, Zurich,
Entertainment; Las Vegas, Monaco, DisneyWorld_X, Smithsonian Institute,
Militaristic; NATO bunker, Murmansk
Yep, some of these aren't exactly City/States... but considering Political allegiance is a tricky process when Civs (even real city lists might interfere) battle for control - you could say, the regional Zones are somehow delicately kept under Friendly concepts.
Plenty more, feel free to extrapolate even further -- i'm too tired to add anything right now.
See ya.