ZIP Code Guides
Best Ways to Use a ZIP Code Lookup Tool
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
Postal Tips
How ZIP Codes Help Mail Delivery
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
Postal Tips
What ZIP+4 Means and When to Use It
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
State Guides
How to Find ZIP Codes by State
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
City Guides
Why Some Cities Have Multiple ZIP Codes
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
Data & Demographics
How ZIP Codes Are Assigned in the United States
A practical guide for using ZIP code data, postal records, and location lookup tools with confidence.
Address Formatting
How to Write a US Mailing Address Correctly
Format U.S. mailing addresses clearly so letters and packages move through the mail stream.
Postal Tips
ZIP Code vs Postal Code: What Is the Difference?
Understand how U.S. ZIP codes compare with postal code systems used around the world.
ZIP Code Guides
What Is a ZIP Code and How Does It Work?
A simple explanation of how ZIP codes organize mail delivery and location data.
ZIP Code Guides
How to Find a ZIP Code by City and State
Learn a practical workflow for finding ZIP codes when you know the city and state.