Fairfax GIS Data
Fairfax County GIS & Mapping Services provides free access to many GIS datasets via Open Data, as well as a dataset for purchase. By accessing any of the data, maps, or applications provided by Fairfax County, you agree to the terms in our disclaimer.
Free GIS Data
Visit Fairfax County's Open Data site for access to over 100 free vector layers for use in GIS and other mapping applications. Datasets may be accessed and downloaded in multiple formats, including: Shapefile, KML, CSV and JSON.
Free GIS viewing software is available from private vendors (ex: Esri's Explorer products).
GIS Data for Purchase
The Topography Dataset is available for purchase. The data provided are: DEM (digital elevation model), 2' elevation contours, spot elevations, breaklines, and masspoints, all in both NAVD88 and NGVD29 vertical datums. (For more information on datums, please visit the National Geodetic Survey's FAQ page). These data were developed from 2009 aerial photography. (note: the elevation contours and spot elevations are the same data as that included in the Property and Topography dataset after August 2013).
Each county quadrant is available for $148 (plus tax); countywide coverage is $592 (plus tax). Please refer to the map below for assistance in determining quadrant(s) of interest.
To purchase data:
- Complete the online Topography Data Order Form.
- Print the completed form and mail it, with a check or money order, to Fairfax County GIS & Mapping Services. (Alternately, you may email your order form to: GIS.HelpQ@FairfaxCounty.gov, but your order will not be processed until payment is received.)
- Once payment is received, you will be emailed a ShareFile link to your data.
- You will have 7 days to download your data before your link expires.