Moonlight Falls was “inspired by the misty valleys of the Pacific Northwest”. EA representatives have not gone into detail about the world, but have described it as a mysterious town, filled with mystical creatures.
Bridgeport is a world that ships with The Sims 3: Late Night. It is the first urban city of its kind to be featured in The Sims series games as most past neighborhoods and worlds were either towns or suburbs
Twinbrook is a world which shipped with The Sims 3: Ambitions. It is most likely named after the twin rivers that flow on either side of the richer part of the town, near households such as the Whelohffs.