Financial publisher Main Street pulled Census data to put together a list of the country's richest 15 counties - and counties surrounding Washington D.C. dominated the list.
The publication put the list together based on median household income.
Area counties in the top 15 richest:
15. Charles County, MD - median household income: $87,007
14. St. Mary's County, MD - median household income: $88,444
13. Calvert County, MD - median household income: $88,862
12. Montgomery County, MD - median household income: $89,155
9. Prince William County, VA - median household income: $92,655
7. Stafford County, VA - median household income: $94,317
5. Arlington County, VA - median household income: $94,986
3. Howard County, MD - median household income: $101,771
2. Fairfax County, VA - median household income: $103,010
1. Loudoun County, VA - median household income: $119,540
In Loudoun County, the population doubled from 2000 to 2010, but the poverty rate stayed low - listed at 3.2 percent.
See the rest of the list here.