United States ZIP codes
United States
47.3K
5 chars
52
4
Interactive Map
Explore United States's 52 states with our interactive map.
Find Post Offices
Locate post offices across United States. Find addresses and contact information.
Understanding United States ZIP codes
E‑commerce flows to United States require accurate five-digit postal data (99553); without it, US partners may hold parcels or downgrade service.
Key Characteristics
Code Type
Numeric
Administered By
National Postal Service
Coverage
Nationwide
ZIP code format breakdown
United States uses numeric zip codes with 5 digits (example: 99553). In our directory, these codes are organized from states down to places.
Visual Structure
E‑commerce flows to United States require accurate five-digit postal data (99553); without it, US partners may hold parcels or downgrade service.
Administrative Hierarchy
How United States organises areas for ZIP codes
States Directory
Browse all 52 top-level divisions
Addressing Mail to United States
Step-by-step guide for correct address formatting
Sample Address Block
Name; Street; City, State Postcode; Country
Delivery Best Practices
Tips for successful mail and package delivery
Always verify the ZIP code
Verify your ZIP code is complete (5 digits) before sending. Use our lookup tool to confirm accuracy.
Include all address levels
Write the full address hierarchy for best results.
Avoid abbreviations
Write out full state names to prevent sorting errors.
Don't omit the ZIP code
Missing ZIP codes cause significant delivery delays and may result in returned mail.
Shipping to United States
What to know when sending packages
Standard domestic delivery within United States typically takes 2–7 business days. International packages require complete address information including the ZIP code. Always include the correct 5-character code for fastest routing.
Frequently Asked Questions
Common questions about United States ZIP codes
What is the ZIP code format for United States?
United States uses 5 digits in the ZIP code. An example is 99553. E‑commerce flows to United States require accurate five-digit postal data (99553); without it, US partners may hold parcels or downgrade service.
How many states does United States have?
United States has 52 states with ZIP code coverage. Use our browse tool to explore them.
How do I find my ZIP code in United States?
Use our free lookup or browse by state to find the exact ZIP code for your location.
Where do I write the ZIP code on a United States address?
The ZIP code is written on the same line as or immediately after the state, before the country name when mailing internationally.