National Address Database

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The U.S. Department of Transportation (USDOT) and its partners from all levels of government recognize the need for a National Address Database (NAD). Accurate and up-to-date addresses are critical to transportation safety and are a vital part of Next Generation 9-1-1. They are also essential for a broad range of government services, including mail delivery, permitting, and school siting. To date, there has been no national database of address points in the public domain. In many cases, such data already exist at the State and/or local level, and USDOT believes that a NAD can be built from state and local level and aggregated up to the national level.

In April of 2015, the USDOT hosted the National Address Database (NAD) Summit. The Summit convened stakeholders from all levels of government and the private sector to identify the possible alternatives for developing a NAD with the pros and cons of each alternative identified based on real use case examples that are currently in-place. The Summit confirmed USDOT’s belief that a NAD can be built from data collected at the State and local level. Based on recommendations from that Summit, USDOT secured funding to sponsor a NAD pilot project, which kicked off in October 2015.

The NAD pilot focused heavily on identifying a minimum data content guideline for the NAD. To assist in this, address data schemas and workflows from 10 States and 4 counties/cities were examined. From this effort, a minimum content guideline and associated data schema were developed and then reviewed by the attendees of the NAD Summit.  Comments were incorporated or adjudicated, and the final guideline, schema, and geodatabase template were published in the spring of 2016. Once this was completed, address datasets were received from Arkansas, Arizona, and Boone County, Missouri. The pilot team then developed Extract, Transform, Load (ETL) scripts to load this data into the new schema. In addition, 7 additional States (Colorado, Connecticut, Montana, New Jersey, Ohio, Utah, and Virginia), the District of Columbia, and 10 additional Missouri cities/counties have volunteered to develop their own ETLs in order to include their data in the NAD.

An initial version of the NAD will be released early in 2017. Check back to this site for updates.

Updated: Thursday, April 27, 2017
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