If you are trying to find the correct zip code for an address, the United States Postal Service (USPS) website has a quick and easy tool that you can use for free.
However, if you are trying to find the correct postal zip code for multiple addresses in a list, you might want to review our address correction tools. In addition to assigning zip codes to multiple records at a time, our address correction software will fix misspelled city names and improper state abbreviations, as well as standardize the street directions and road names.
If you really want to clean up a mailing list, you might consider using our advanced address list correction tool, which will provide the address someone has moved to (provided they have filled out a change of address card online or at the post office).
Visit LetterStream.com to send first-class and Certified Mail utilizing our advanced address correction tools.
