US United States Major Regions Postal Code Details
๐๏ธ Johnson ยท Iowa
52243
American College Testing
52241
Coralville
52322
Cosgrove
52338
Cou Falls
52235
Hills
52244
Iowa City
52755
Lone Tree
52317
North Liberty
52241
Oakdale
52322
Oxford
52755
River Junction
52338
Shueyville
52333
Solon
52338
Swisher
52340
Tiffin
52333
Twin View Heights
52246
University Heights
52322
Windham
๐ฎUS United States Regional Postal Code FAQ & Postal Regulations
๐ฎ What is the format of a US ZIP code?
Standard format is 5 digits (e.g., 10001). Extended format is ZIP+4 (9 digits like 10001-1234) with a hyphen.
๐ How to find the ZIP code for an address?
Use the USPS ZIP Code Lookup tool by entering the full address on the official USPS website.
โ ๏ธ What happens if I use a wrong ZIP code?
Mail may be delayed, returned, or lost. For important documents, use USPS tracking and verify the ZIP code.
๐ Do ZIP codes ever change?
Yes, USPS may update ZIP codes due to regional adjustments. Always confirm your ZIP code after an address change.
๐ฆ Is a ZIP code required for international mail to the US?
Absolutely. Always include the US ZIP code at the end of the address (e.g., New York, NY 10001 USA).