Official USPS Zip Code Lookup Tool
Find a correct ZIP+4 Code by entering an address at this USPS website. Results also include correct address formatting and mailing industry information for higher level barcoding and sortation. For reverse lookups and Zip Code area maps, visit this non-USPS website: www.unitedstateszipcodes.org
PostCom website maintained by the Association for Postal Commerce, or PostCom. A robust website with mailing news and updates from around the globe.
Daily e-news site managed by the postal employee unions. Includes internal USPS news and communications, links to articles about the Postal Service from news media around the country, and Congress and PRC news.
Consumers for Paper Options
Consumers for Paper Options is organized by the American Forest & Paper Association (AF&PA) and the Envelope Manufacturers Association (EMA) to bring together industry, non-profits and consumers. It works to address the transition to Internet-only resources at the exclusion of millions of citizens who still need paper-based options. The goal of Consumers for Paper Options is to preserve access in a way that neither hinders the natural evolution of technology nor discriminates against those who may not, or cannot, use it.