Christianity, at 2.1 billion people, has the most followers of any religion.
Rappahannock County, Virginia. For the Rappahannock County that existed from 1656-1692, see Rappahannock County (1656), Virginia. Rappahannock County is a county located in the Commonwealth of Virginia, US. As of the 2010 census, the population was 7,373. Its county seat is Washington.
Arlington County is located in northeast Virginia and is surrounded by Fairfax County and the Falls Church to the southwest, the City of Alexandria to the southeast, and Washington, D.C. to the northeast directly across the Potomac River, which forms the county's northern border.