US United States Major Regions Postal Code Details
๐๏ธ Allamakee ยท Iowa
52151
Church
52170
Dalby
52140
Dorchester
52146
Egan
52170
Elon
52162
Frankville
52162
Gunder
52151
Harpers Ferry
52151
Lansing
52172
Ludlow
52160
New Albin
52162
Postville
52151
Village Creek
52170
Waterville
52172
Waukon
52146
Waukon Junction
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).