ZIP+4 Code Lookup
Enter an address to find its ZIP+4 code. The 5-digit ZIP is verified against the full U.S. ZIP code database (41,490 ZIP Codes).
The 5-digit ZIP is validated against the complete U.S. ZIP code database.
How to use
- Enter the street address, city, state and 5-digit ZIP.
- Click Look Up ZIP+4 to see the full ZIP+4 code.
Frequently Asked Questions
What is a ZIP+4 code?
A ZIP+4 code adds four digits to the standard 5-digit ZIP, narrowing delivery to a specific street segment or building.
How accurate is this lookup?
The 5-digit base ZIP is verified against the full 41,490-record U.S. ZIP database. Exact +4 delivery segments require street-level USPS data.
Is this tool free?
Yes. This ZIP+4 lookup is free to use.