Communities with the highest median income

9. Concord

2009 median income: $157,538
1999 median income: $149,432
1989 median income: $138,718
1979 median income: $101,685
30-year change: 54.9 percent

Fun Fact: Henry David Thoreau, the 19th-century author best known for his book "Walden," was born in Concord, in the house pictured here.