US United States Major Regions Postal Code Details
๐๏ธ Mercer ยท Illinois
61231
Aledo
61412
Alexis
61281
Boden
61281
Cable
61231
Hamlet
61260
Joy
61442
Keithsburg
61263
Matherville
61231
Mercer
61272
New Boston
61465
New Windsor
61466
North Henderson
61231
Ohio Grove
61231
Old Gilchrist
61276
Preemption
61281
Richland Grove
61476
Seaton
61231
Shale City
61412
Shanghai City
61281
Sherrard
61231
Sunbeam
61486
Viola
61231
Wanlock
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).