Data Last Updated: June 1, 2023
U.S. ZIP +4 Historical Database
ZIP plus four Historical Database (9 digit ZIP Codes)
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What is a ZIP+4 Historical Database?
Our Historical database contains every U.S. street and address range, with its related 9 digit ZIP Code, put into row and column CSV format for easy use and manipulation going back for many years. With over 50 unique fields of information and every 9 digit ZIP Code in the United States, it gives you an unlimited number of ways to analyze all the U.S. ZIP +4 information. Our ZIP plus 4 Database is a great tool for address verification, building websites, geotargeting, sales tax, and general analysis.
* The Standard database Lat/Lon & Census Tract/Block coverage is approximately 60% of available coordinates.
† The Premium database Street based Centroid Lat/Lon & Census Tract/Block Group coverage is approximately 80+% of available coordinates.
‡ The Deluxe database Building based Centroid Lat/Lon & Census Tract/Block Group coverage is approximately 95+% of available coordinates.
Why trust our ZIP+4 Database?
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Are there parts to a ZIP Code?
Yes, a full ZIP+4 is actually comprised of 5 parts. 12345-6789 for instance may be grouped as   [ - ]  .
Why do ZIP+4 records come in low/high ranges instead of individually?
For most addresses, a single ZIP+4 is the norm. Just 1 ZIP+4 will cover several houses on a block or side of the street. However, large businesses or those receiving a large volume of mail may be given a range of ZIP+4 codes so that they can route mail to specific departments. A range of ZIP+4 codes may also be assigned to a corresponding range of PO Boxes (PO Box 1004 would have ZIP+4 1004), or a single PO Box could have a full range of ZIP+4 codes (PO Box 1004 would have ZIP+4 1000 through 1100).
Because the USPS allows some instances of ZIP+4 ranges, the requirement to display the data in ranges applies to even singular ZIP+4 codes.
What does ND as the last two characters in a ZIP+4 mean?
ND as the last two characters in a ZIP+4 mean “Non Deliverable”. It simply means that the USPS has this in their system, but does not actively deliver the mail to that address. USPS documentation has this to say about non-deliverable addresses: “Non-deliverable areas are areas to which the USPS does not deliver mail, such as vacant lots and land that borders railroad tracks. Mailers should not match an address identified as a non-delivery area.”
How do you match data from 5-digit database to the ZIP+4 database?
The ZIP+4 database is very large and is missing certain pieces of information such as City. City information can be retrieved from the included 5-digit ZIP Code database.
Most people match ZIP+4 to ZIP Code in the 5 digit ZIP Code Database using just the ZIP Code. While this method works, a more precise method of matching is using the Preferred Last Line City State key from the ZIP+4 database and matching this to the City State Key in the 5 digit ZIP Code Database. This will provide the city and state names which are available for this ZIP+4 record. From there, please use the MailingName field to determine if a City Alias is valid for mailing purposes or not.
Urbanization names only exist for records in Puerto Rico. For Puerto Rico ZIP+4 records only, you can obtain the Urbanization City State Key and match this to the City State Key in the 5 digit ZIP Code database. In the matching 5 digit ZIP Code database record, the City Name field will contain the urbanization name. The same process is used to obtain the municipality name.
The city name in the 5 digit ZIP Code Database can contain many types of names: preferred last-line, urbanization, municipality, and other names by which a given 5-digit ZIP Code is known.
Do you have any other formats for the data?
Unfortunately, no. CSV is the most concise and versatile format for transferring the ZIP+4 data from system to system. It is the only data format we provide this information in.
What is from/to latitude and longitude
ZIP+4 records, for the most part, represent a number of houses, apartments, or businesses along a street. They do not represent singular points. In an attempt to provide more useful information regarding location, a starting point (From Latitude and From Longitude) indicate where a ZIP+4 record begins while the ending point (To Latitude and To Longitude) indicates where it begins. All areas between those two points can be thought of as being part of that ZIP+4.
Unfortunately, not all ZIP+4 Codes are straight lines. Many areas curve, bend, and follow streets that are not in a straight line, so some interpretation and understanding of what is physically in between those two points must be taken into account.
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