Population: 209,969
Single: 41.5%
Median family income: $132,580
Washington D.C. is now the wealthiest city in America, but a healthy number of D.C. politicos don’t live in the nation’s capital — but across the Potomac in Arlington instead. With many of the city’s political professionals residing here, singles are likely to find successful up-and-comers to mingle with, and hip Clarendon is often considered the go-to neighborhood for young wonks.