You can get the four digit ZIP code extension from the United States Postal Service (USPS) website. Simply type in your mailing address and click "Find". For example, if you live at 1600 Pennsylvania Ave NW in Washington, DC, then your postal code+4 extension will be 20500-0003. If you do not see your address in the search results, check the title and description to ensure that the four digits are spelled correctly.
If you're mailing a bulk mailing, you may qualify for a discount through the U.S. Postal Service. To get the lowest rates, try a third-party bulk mail service. The U.S. Postal Service gives bulk mailings discounts. The number of digits in your ZIP code can vary from five to nine. Most people recognize the first five, but don't know the other four.
If you want to find out what the four-digit extension means, you can use several sources. You can search for the phrase "4-digit zip code extension" and then click on the best link. A sample of what the four-digit extension includes is the Washington ZIP code 5 Plus 4. In addition to the five-digit ZIP code, this code will also include the City Name, County FIPS, and State Abbr.
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