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Master Address Repository


The MAR is a database of building addresses, intersections and other location identifiers in the District. Each address in the database has been assigned a unique Address Identification Number (AID), map coordinates and other useful information.  

It is built and distributed using DC’s service-oriented architecture. The MAR Sample Client is built from two SOAP web services: the MAR service and the BasicMap service. This makes it easy for DC agencies to embed standard address and spatial searching into their applications and web sites.

*Please uninstall previous versions of the MAR Batch Geocoder.

The MAR:

Facilitates analysis across systems and agencies. The MAR allows the District government to more easily compare information across databases and agencies. The format and quality of address information varies across government systems, making it difficult for government to identify all the activity associated with a given address. Now, DC Addressing Standards are built into the MAR. These standards define the valid components of DC addresses (AID, Number, Street Name, Street Type and Quadrant), including their correct formatting and spelling.

Acts as a local gazetteer. It employs spell checking and lists of street names and street types “aliases” (eg, MLK Ave) to make locating addresses as easy as possible. In addition to locating addresses, the MAR also helps users find intersections (4th Street NW and D Street NW), blocks (4th Street NW between D Street and E Street, or the 400 block of 4th Street NW), and place names (One Judiciary Square, also known as 441 4th Street, NW). In most cases, the MAR returns the specific building desired.
Now informs users of alias names and condo / apartment units associated with the searched for address. This enhancement was added to simplify the process of finding associated alias names and condo / apartment information.

 

Service Need

The MAR is a database of building addresses and other location identifiers in the District. Each address in the database has been assigned a unique Address Identification Number (AID), map coordinates and other useful information.

 

Service at a Glance

Provided By: OCTO
Phone: (202) 727-6421
Days: Monday - Friday
Time: 9:00 am - 5:00 pm
Location: 200 I Street SE, 5th Floor Washington, DC 20003
 

Request this Service

 

Related Services

  • Vector Property Map Guide
  • All Online Maps
  • Data Catalog
 

Related Documents

  • Address Standards
  • MAR Data Dictionary
  • MAR Geocoder User Guide
  • Address Anomalies Report
  • Troubleshooting the Geocoding Process
  • Master Address Repository Presentation
  • Frequently Asked Questions (FAQ) of the MAR
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    Related News

    • Enhanced Address Ranges Now Available in the DC Street Centerline File
    • DC Master Address Repository Wins Digital Government Achievement Award
    • DC MAR Wins 2006 FOSE Centers of Excellence Award
    • DC GIS Announces the New Master Address Repository Sample Client
     

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