US United States Major Regions Postal Code Details
🏛️ Valdez Cordova · Alaska
99574
Chenega Bay
99566
Chitina
99573
Copper Center
99677
Cordova
99586
Gakona
99693
Girdwood
99588
Glennallen
99586
Gulkana
99586
Miers Lake
99586
Slana
99677
Tatitlek
99686
Valdez
99693
Whittier
📮US United States Regional Postal Code FAQ & Postal Regulations
📮 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.
🔍 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.
⚠️ 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.
🔄 Do ZIP codes ever change?
Yes, USPS may update ZIP codes due to regional adjustments. Always confirm your ZIP code after an address change.
📦 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).