Prince George's County is located in the U.S. state of Maryland located immediately north, east, and south of Washington, D.C. As of 2007 U.S. Census Bureau estimates, it has a population of 828,770 and is the wealthiest county in the nation with an African-American majority.
The county was named for Prince George of Denmark (1653-1708), the brother of King Christian V of Denmark and Norway, and husband of Queen Anne of Great Britain. It is frequently referred to as 'P.G. County,' however this abbreviation is viewed as pejorative by some residents.
Prince George's County was created by the Council of Maryland in 1696 from portions of Charles and Calvert Counties and a portion was detached in 1748 to form Frederick County. Since Frederick County was subsequently divided to form the present Allegany, Garrett, Montgomery, and Washington counties, all of these counties in addition were derived from what had up to 1748 been Prince George's County. Courtesy of http://en.wikipedia.org/wiki/Prince_George's_County,_Maryland