How to Find a ZIP Code in the US — Complete Guide (2026)

Need to find a ZIP code for a US address? Whether you're mailing a package, filling out an online form, or verifying an address — knowing the right ZIP code is essential. This guide covers every method to find US ZIP codes quickly and accurately.

1. Use Our Free ZIP Code Lookup Tool

The fastest way: use our US ZIP Code Lookup. Browse by state or search by city name. We have 41,000+ ZIP codes covering all 50 states.

→ Try the ZIP Code Lookup now

2. Use the Official USPS ZIP Code Lookup

The United States Postal Service provides an official lookup tool at usps.com. Enter a street address, city, and state to get the exact ZIP+4 code. This is the most authoritative source but requires a full address.

3. Find ZIP Codes by City or State

If you only know the city and state, you can find all ZIP codes for that location:

• Go to our US ZIP Code directory
• Select your state (e.g., California)
• Browse the list of cities and their corresponding ZIP codes

Major cities like New York, Los Angeles, and Chicago have multiple ZIP codes — each covering specific neighborhoods and streets.

4. What Is a ZIP+4 Code?

A ZIP+4 code adds 4 extra digits to the standard 5-digit ZIP (e.g., 90210-1234). These extra digits identify a specific block, building, or PO box — making mail delivery more precise. While the 5-digit code is sufficient for most purposes, the ZIP+4 helps USPS sort mail more efficiently.

5. Common ZIP Code Questions

What's the difference between ZIP code and postal code?

They're the same thing — "ZIP code" is the US term, while "postal code" is used internationally. The USPS trademarked "ZIP code" in 1963.

Can one city have multiple ZIP codes?

Yes. Large cities often have dozens or hundreds of ZIP codes. New York City alone has over 200 ZIP codes.

How often do ZIP codes change?

USPS adds, splits, or retires ZIP codes periodically — typically a few dozen changes per year. Always verify with an up-to-date lookup tool.