United States
17.4K
5 chars
52
4
Explore United States's 52 states with our interactive map.
Locate post offices across United States. Find addresses and contact information.
United States uses a 5-character postal code system. Postal code format varies by country (often 4–6 digits; some use alphanumeric).
Key Characteristics
Code Type
Numeric
Administered By
National Postal Service
Coverage
Nationwide
Visual Structure
Postal code format varies by country (often 4–6 digits; some use alphanumeric).
How United States organises its postal regions
Browse all 52 top-level divisions
Step-by-step guide for correct address formatting
Sample Address Block
Name; Street; City, State Postcode; Country
Tips for successful mail and package delivery
Always verify the postal code
Double-check the 5-character code 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 postal code
Missing postal codes cause significant delivery delays and may result in returned mail.
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 postal code. Always include the correct 5-character code for fastest routing.
Common questions about United States postal codes
United States uses a 5-character postal code. An example is 1000. Postal code format varies by country (often 4–6 digits; some use alphanumeric).
United States has 52 states with postal code coverage. Use our browse tool to explore them.
Use our free postal code lookup or browse by state to find the exact code for your location.
The postal code is written on the same line as or immediately after the state, before the country name when mailing internationally.
United States
17.4K
5 chars
52
4
Explore United States's 52 states with our interactive map.
Locate post offices across United States. Find addresses and contact information.
United States uses a 5-character postal code system. Postal code format varies by country (often 4–6 digits; some use alphanumeric).
Key Characteristics
Code Type
Numeric
Administered By
National Postal Service
Coverage
Nationwide
Visual Structure
Postal code format varies by country (often 4–6 digits; some use alphanumeric).
How United States organises its postal regions
Browse all 52 top-level divisions
Step-by-step guide for correct address formatting
Sample Address Block
Name; Street; City, State Postcode; Country
Tips for successful mail and package delivery
Always verify the postal code
Double-check the 5-character code 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 postal code
Missing postal codes cause significant delivery delays and may result in returned mail.
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 postal code. Always include the correct 5-character code for fastest routing.
Common questions about United States postal codes
United States uses a 5-character postal code. An example is 1000. Postal code format varies by country (often 4–6 digits; some use alphanumeric).
United States has 52 states with postal code coverage. Use our browse tool to explore them.
Use our free postal code lookup or browse by state to find the exact code for your location.
The postal code is written on the same line as or immediately after the state, before the country name when mailing internationally.