US United States Major Regions Postal Code Details
๐๏ธ Skagit ยท Washington
98233
Alger
98232
Allen
98221
Anacortes
98232
Bow
98233
Burlington
98235
Clearlake
98237
Concrete
98238
Conway
98221
Decatur Island
98283
Diablo
98232
Edison
98221
Guemes
98221
Guemes Island
98255
Hamilton
98257
La Conner
98263
Lyman
98267
Marblemount
98273
Mount Vernon
98283
Newhalem
98283
Rockport
98232
Samish Island
98284
Sedro Woolley
98221
Similk Beach
98233
Upper Skagit Indian Reservat
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).