Wikipedia:Keep It Simple/US state

This a Keep It Simple Label to indicate that you reside in a US state (e.g. . It automatically adds users who display it to (for example) the Users in category.

Usage
{&#123;WP:KIS/US state|AL}} links to WikiProject Alabama.

{&#123;WP:KIS/US state|AL|article=yes}} links to Alabama state's article.

Replace "AL" with your state's postal code.