Do you have a need to check if an address is valid in Fairfax County? Do you want to know how to officially format any Fairfax County address? The new Master Address Repository (MAR) application will let you do this and much more.  

• The new application is map based and allows for reporting and visualization of addresses in their physical location. 
• Search by street number, street name, city, ZIP Code, subdivision, parcel number, creation date, and expiration date. 
• Addresses can also be easily exported to file formats for use in Microsoft Office products. 
• Additionally, there is a street name search function to find valid street names in Fairfax County.