How do I find a ZIP code by city or state?

Use our ZIP code lookup tool to search by city, state, or address and instantly view related ZIP codes.

What is a ZIP+4 code?

A ZIP+4 code adds four extra digits to a standard ZIP code to help USPS sort and deliver mail more accurately.

ZIP codes are the postal code system used in the United States. Other countries use different postal code formats.

Postal Guide 🗓 July 23, 2026

ZIP codes are not permanent. USPS regularly adds, splits, and retires them. Learn how to stay current and what to do if your ZIP code changes.

Postal Guide 🗓 July 20, 2026

When you move, your ZIP code affects mail, insurance, taxes, voter registration and more. Complete checklist for handling ZIP code changes.