The ZIP Plus 4 Database Premium Plus Centroids product includes over 64 million records, detailing the 5-digit ZIP Code and 4-digit extensions representing ZIP Code Sector and ZIP Code Segment.
A ZIP Code can represent one side of a street, a floor in a building, or a specific Post Office Box. The ZIP Code Sector (1234) represents a collection of addresses below the ZIP Code level. The ZIP Code Segment (1234) is more specific and always refers to a smaller set of addresses or a single address. In the case of PO Boxes, the ZIP segment is almost always the last two digits of the PO Box number. The four-digit ZIP Code extension is used by the United States Postal Service (USPS) to facilitate efficient mail handling and delivery.
ZIP Plus 4 Database Premium Plus Centroids also includes thirty postal attribute fields to provide the detail needed to assist in utilizing ZIP+4 data for internal processing and analysis. Additionally, Census block group codes, which include state, county, and tract codes, are provided for each ZIP+4 record.
The following ZIP Code types may not be included in ZIP Plus 4 Database Premium Plus Centroids, especially if a single/best georeferenced location cannot be determined:
- Military ZIP Codes (e.g., overseas locations, ships at sea)
- Department of Homeland Security (DHS) ZIP Codes
- Parcel Return Service ZIP Codes