US United States Major Regions Postal Code Details
๐๏ธ Jones ยท Iowa
52205
Amber
52205
Anamosa
52212
Center Junction
52205
Fairview
52362
Hale
52252
Langworthy
52305
Martelle
52310
Monticello
52312
Morley
52320
Olin
52321
Onslow
52323
Oxford Junction
52323
Oxford Mills
52310
Scotch Grove
52362
Wyoming
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).