Loudoun County is once again the richest county in the U.S., according the latest Census Bureau estimates.
The county boasts a median household income just shy of $126,000, the tops in the nation.
Almost 10,000 Loudoun residents commute to D.C., while the vast majority find well-paid jobs in the county. Top local employers include Dulles Airport, Loudoun County Public Schools and the Department of Homeland Security.
Others are employed within the vast array of technology companies and at data centers.
While Loudoun takes the top spot, according to the 2015 Census Bureau estimates, half of the richest counties in America are within an hour of the District of Columbia.