Prince William County maintains a monument network that supports the development requirements established by the County. These requirements ensure data accuracy through plats and plans submitted by our development community. The monument network consists of 104 National Geodetic Survey (NGS) Blue-Booked monuments and approximately 105 supplementary monuments.
The County Mapper web application provides locations and description for the County's 17 high accuracy monuments. All of the NGS Blue-Booked monuments have NGS Data Sheets which are located through the NOAA NGS Web site.