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The dataset not only contains polygons that designate the legal geographic boundaries between county, city and towns within the boundaries of Prince William County as well as the polygonal areas of extra-jurisdictional parcels that are not entirely within the legal boundary of Prince William County but whose citizens pay fees or taxes to Prince William County in exchange for services. The legal boundaries are changed thru legislation between the Prince William County Board of County Supervisors and the other town and city political entities located within PWC, whereas the extra-jurisdictional boundaries are changed when parcel changes occur. 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