# Zip + Post codes

> What are some interesting input tests for zipcodes?

## US Zipcodes

* 00501
  * Lowest ZIP
  * Holtsville, NY
  * Also detects fields that might truncate leading zeros
* 99950
  * Highest ZIP
  * Ketchikan, AK
* 06390
  * NY ZIP that Belongs in Connecticut?
  * Fishers Island, NY.
* 12345
  * General Electric’s Unique ZIP
  * Schenectady, NY.
* 20252
  * Smokey Bear’s Personal ZIP
  * Washington, DC.
* 22313
  * P.O. box only ZIP
  * Alexandria, Virginia.  
* 99530-9998  
  * ZIP for Santa Claus in the north pole.
  * Anchorage, AK.

## Non-US Postal Codes

* H0H 0H0
  * Post Code for North Pole
  * North Pole, Canada
* LL61 5QH
  * Post Code for Llanfair­pwllgwyngyll­gogery­chwyrn­drobwll­llan­tysilio­gogo­goch
  * Sometimes abbreviated to Llanfairpwllgwyngyll
  * Wales, UK

## Zipcode Formats

* 5 digits (ZIP)
  * 99530
* 9 digits (ZIP + 4)
  * 995309998
* 10 digits (ZIP + "-" + 4)
  * 99530-9998