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The population of Prince William County, VA on December 15th 2011 is approximately 407,739. (Extrapolated from a population of 383,644 on May 24th 2008 and a population of 402,002 on February 4th...
Yes it is in prince William county
338 Square Miles
the best place to go is radio shack and buy a code book or most radio shacks will give a readout of area codes for free. call them and find out.