US United States Major Regions Postal Code Details
🏛️ Clark · Washington
98601
Amboy
98604
Battle Ground
98606
Brush Prairie
98607
Camas
98601
Chelatchie
98622
Heisson
98629
La Center
98662
Orchards
98642
Ridgefield
98666
Vancouver
98671
Washougal
98675
Yacolt
📮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).