#16 Round Hill-North Greenwich in Greenwich, Conn.
Mean household income: $510,848
Round Hill joined the National Register of Historic Places in 1996 with a district school that dates back to 1750, among other early structures.
North Greenwich and Round Hill play home to a lot of financiers and hedge fund managers who work either in downtown Greenwich, where many firms have headquarters, or Manhattan.
The town of Greenwich, the municipality that sits farthest southwest in Connecticut, was established in 1640 by the British daughter-in-law of John Winthrop, the Massachusetts colony founder.
Round Hill-North Greenwich is 97.5 percent white, 0.0 percent Asian, 2.4 percent Latino, 0.1 percent black
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