GIS FAQs


If your question or concern regarding Fairfax County GIS data is not addressed here, please contact our office.

Frequently Asked Questions

What is GIS?

How is GIS used in Fairfax County?

How does GIS help me?

What map products does Fairfax County provide?

How can I obtain county GIS data?

How can I verify an address in Fairfax County?

I have a question about a parcel in Fairfax County. Where can I get help?

Do you have aerial imagery?

Where can I find house location plats?

Who do I contact about subdivision plats & plans?

Where do I find a copy of a recorded deed?

How do I access floodplain maps and studies?

Do you sell a street atlas for Fairfax County?

Do you sell the property map books and zoning map books?

Do you have maps that show contour lines?

What is GIS?

GIS stands for Geographic Information System. A GIS is a computer system - hardware and software - that helps analysts discover relationships between and among sets of computer-readable, geographically referenced data. These relationships are not easily seen or understood without the aid of this technology. For more details, you can read a longer explanation at GIS.com (external website).

How is GIS used in Fairfax County?

GIS enables the County to display and analyze geographically referenced information. More than 75% of County information can be referenced geographically (e.g. street addresses, parcels). Most agencies rely on this information to support their operations, create efficiencies, and allow for sophisticated analyses. GIS is used in every fire engine and police vehicle to speed dispatch of the closest units to an incident. GIS provides housing and population forecasts used for planning by several County agencies. The Department of Public Works and Environmental Services uses it to manage stormwater and sanitary sewer infrasctructure across the county. GIS data that the County uses for making decisions is updated, maintained, and made available as business requires, often on a daily basis.

How does GIS help me?

By making the County's maps and data accessible quickly on-line, residents and businesses have access to a wealth of information to help better understand the County that they live and conduct business in. The map-centric viewability of GIS enables residents to more easily locate relevant information (e.g. assessments, voting results, permitting information, bike trails, parks, etc.). GIS allows decision makers and residents to visualize complex information. It helps build understanding and consensus between government and residents on issues that confront the community. GIS also makes the County Government more efficient. Improved efficiency means better services at less cost.

What map products does Fairfax County provide?

The Fairfax Geoportal links to dozens of interactive mapping applications to serve various needs of county residences and other members of the public. More traditional (static) map products can be found in the Map Gallery. Many of these maps are also available for sale at the GIS & Mapping Services office. See our price list for details.

How can I obtain county GIS data?

We have over 40 layers available as free, downloadable shapefiles. We also sell aerial imagery and our Property & Topography Dataset. For more information, visit our GIS Data page.

How can I verify an address in Fairfax County?

The My Neighborhood application can be used to search for, verify and locate addresses within Fairfax County. Non-county addresses (e.g. in Fairfax City or Falls Church) will not be found using this application. Further questions regarding addressing should be directed to the Customer and Technical Support Center of the Code Development and Compliance Division of Land Development Services (a branch of the Department of Public Works and Environmental Services). They can be reached at 703-222-0801. Or, visit their customer service desk in Suite 224 of the Herrity Building (12055 Government Center Pkwy).

I have a question about a parcel in Fairfax County. Where can I get help?

Many parcel questions can be answered by utilizing the My Neighborhood or Real Estate Assessment Information Site online applications.

Responsibility for parcel data is shared between the GIS & Mapping Services Office & the Department of Tax Administration. For map-specific questions (regarding the existence or shape of parcels) not resolved by referring to our online applications, please contact the GIS & Mapping Services office. Questions regarding information associated with the parcels (ex: ID number, owner, sale dates, assessed values) should be addressed to the Department of Tax Administration at 703-222-8234. They are located in Suite 223 of the Government Center (12000 Government Center Pkwy). Or, visit their website.

Do you have aerial imagery?

Yes. Our collection dates back to 1937. For more information, go to our Aerial Imagery page. Digital aerial imagery is also provided in several GIS applications found in the Fairfax Geoportal.

Where can I find house location plats?

House location plats show the location of structures on an individual property. These are maintained by the Zoning Administration Division of the Department of Planning and Zoning, located in Suite 250 of the Herrity Building (12055 Government Center Pkwy). For more information, call 703-222-1082, or visit their website.

Who do I contact about subdivision plats & plans?

Subdivision plats show lot lines for all properties in a subdivision. These plats and plans are housed with Land Development Services section of the Department of Public Works and Environmental Services. Please contact Records and Information in Suite 555 of of the Herrity Building (12055 Government Center Pkwy). For more information, call 703-324-1793, or visit their website.

Where do I find a copy of a recorded deed?

Deeds recorded in Fairfax County are available through the Land Records Division of the County Circuit Court. They are located in Suite 317 of the Fairfax County Courthouse (4110 Chain Bridge Rd). For more information, call 703-691-7320, or visit their website.

How do I access floodplain maps and studies?

This information is available by contacting the Stormwater Planning Division of the Department of Public Works and Environmental Services. They are in Suite 449 of the Government Center (12000 Government Center Pkwy). For more information, call 703-324-5500, or visit their website.

Do you sell a street atlas for Fairfax County?

Yes, but only on a limited basis. Our most recent street atlas book, created in 2009, contains County supervisor district boundaries and the tax map grid in addition to streets and landmarks. See price list for details. A companion street atlas index providing address ranges and tax map numbers is available for download.

Do you sell the property map books and zoning map books?

Yes. Whole County map books (property, zoning, soils, etc.) as well as individual map book pages ( zoning map book only) may be purchased from the GIS & Mapping Services office. See price list for details.

Please note that weekly-updated map book pages, in addition to a library of historic map book pages, are available to view and download for free in our Digital Map Viewer application found in the Fairfax Geoportal.

Do you have maps that show contour lines?

Yes. For more information, click on Map Books - Contour Maps from the Paper Maps page. Updated contour maps are available to view and download through our Digital Map Viewer in the Fairfax Geoportal.


Contact Fairfax County: Phone, Email or Twitter | Main Address: 12000 Government Center Parkway, Fairfax, VA 22035
Technical Questions: Web Administrator

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