Comprehensive Overview of the National Address Database (NAD)

Everything You Need to Know About the National Address Database: The Comprehensive U.S. Address Resource

The National Address Database (NAD) is a comprehensive collection of authoritative address data compiled by the U.S. Department of Transportation (USDOT) in collaboration with state, local, and tribal governments. It contains up-to-date and accurate address records essential for transportation safety, Next Generation 9-1-1 services, and various government functions such as mail delivery and school siting. The NAD aligns with standards set by the National Emergency Number Association (NENA) and the Federal Geographic Data Committee (FGDC).

Data Schema

Field Name Field Description
OID_ Object Identifier
UUID Universally Unique Identifier
State State Name
County County Name
Plus_4 Plus 4 Zip Code Extension
AddAuth Address Authority
NatGrid National Grid Coordinate
St_Name Street Name
Inc_Muni Incorporated Municipality
Latitude Latitude Coordinate
Zip_Code ZIP Code
AddrClass Address Classification
AddrPoint Address Point
Addr_Type Address Type
Longitude Longitude Coordinate
Parcel_ID Parcel Identifier
Placement Placement Method
Post_City Postal City
St_PosTyp Street Post Type
AddNo_Full Full Address Number
Add_Number Address Number
DataSet_ID Data Set Identifier
DateUpdate Date of Last Update
NAD_Source Source of NAD Data
StNam_Full Full Street Name
country_code Country Code
complete_street_address Complete Street Address

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Geography

Nationwide, partial state coverage

The National Address Database (NAD) covers various levels of participation and data processing across the United States, with varying degrees of address data submission by state, county, and local partners. As of the latest update, the coverage includes data from a mix of fully participating, partially participating, and non-participating states, with some data not yet in the public domain or not part of statewide programs.

Frequently Asked Questions

What is the National Address Database dataset?
The National Address Database (NAD) is a comprehensive dataset compiled by the U.S. Department of Transportation, consisting of 80 million accurate and up-to-date address records from various government levels across the United States. It is essential for transportation safety, Next Generation 9-1-1, and a wide range of government services including mail delivery, permitting, and school siting. The NAD integrates authoritative data from state, local, and tribal government address programs, providing a vital resource for geographic information systems and public safety initiatives.
What is the history of this dataset?
The National Address Database (NAD) was developed by the U.S. Department of Transportation (USDOT) in collaboration with partners from all levels of government to address the need for accurate and up-to-date addresses essential for transportation safety, Next Generation 9-1-1, and various government services. The initiative involves state, local, and tribal governments contributing their authoritative address data to the NAD. The schema for the NAD was initially based on standards from the National Emergency Number Association (NENA) and the Federal Geographic Data Committee (FGDC) and has evolved to meet updated content requirements over time.
How often is the data updated?
Sporadically
What is the coverage and what is included in this dataset?
The National Address Database (NAD) offers extensive coverage across the United States, with participation from various states and counties, although not all states have 100% coverage. As of the latest release, the NAD contains 80 million records. The dataset includes accurate and up-to-date addresses, which are critical for transportation safety, Next Generation 9-1-1, and a wide range of government services such as mail delivery, permitting, and school siting. The NAD is compiled with authoritative data from state, local, and tribal governments. The comprehensive nature of this dataset makes it essential for applications in government services, emergency response, and infrastructure planning. The NAD has been working from a schema based on the National Emergency Number Association (NENA) Next Generation 9-1-1 address standard and the Federal Geographic Data Committee (FGDC) Address Data Content Standard, ensuring its alignment with content requirements.
Why is the National Address Database dataset valuable?
The National Address Database is valuable because it provides accurate and up-to-date address data critical for transportation safety, Next Generation 9-1-1 services, and a wide range of government services, enhancing operational efficiency and service delivery across multiple sectors.
How do I join this dataset with other datasets?
You can use Placekey's Join Dataset Tool, here!

Dataset at a glance

Dataset Name
National Address Database
Description
The National Address Database (NAD) compiles authoritative address data from state, local, and tribal governments for use in transportation safety and government services.
Update Frequency
Sporadically
Coverage
Nationwide, partial state coverage
Data Quality
Not assessed.
Dataset Size
Approximately 80 million records.
Maintained By
U.S. Department of Transportation
License

Unknown