US United States Major Regions Postal Code Details
๐๏ธ Knox ยท Illinois
61410
Abingdon
61414
Altona
61428
Appleton
61430
Columbia Heights
61428
Dahinda
61436
Delong
61430
East Galesburg
61402
Galesburg
61436
Gilson
61439
Henderson
61401
Henderson Grove
61458
Hermon
61448
Knoxville
61458
Maquon
61428
Oak Run
61467
Oneida
61472
Rio
61474
Saint Augustine
61485
Victoria
61488
Wataga
61489
Williamsfield
61572
Yates City
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).