Suggested Inputs

  • To standardize an address and find the proper ZIP + 4® code, you must input an address and at least a city or a five-digit ZIP Code™. Supplying the proper state (and as many other fields you know are correct) will speed up the search. ZP4 will standardize any house and apartment number (or Post Office™ or rural route box number), correct any spelling or abbreviation errors in the address, and supply the proper city, state, and ZIP + 4 code.

  • Try to supply any applicable company name or suite number when validating a business address, because they often help determine the proper ZIP + 4 code. After the address search results are returned, it's always a good idea to browse a business address neighborhood to compare suite numbers or to find unexpected company name spellings or abbreviations.

  • You can enter only a ZIP Code to find the city and state for the ZIP®. Beware: ZIP Code allocation in some locations now forces two different place names to share the same five-digit ZIP Code (but different ZIP + 4 codes). The proper city name for an address should always be determined from the address and ZIP + 4 code, not just from the five-digit ZIP Code! For examples, read why all 5-digit ZIP Code lists are obsolete.

  • You can enter only a city, or just a city and state, to find a sample ZIP Code for that location. Beware: larger cities use numerous different ZIP codes, depending on the address!

  • You can enter only a company or organization name, or just the name of a building (in the "company" input field, with no address), to find the address for that organization or location. If possible, include the state and city to narrow the search. The database includes the hundreds of thousands of organizations that have been assigned unique ZIP + 4 codes by the Postal Service™. Many companies are not listed or are listed with unusual spellings or abbreviations. If your company or organization isn't listed and you think it should be, tell the Postal Service.

  • If you have the name of a street but no other information, you need the ZP4 DVD-ROM, which can identify all cities having a given street name.

  • If you have a ZIP + 4 code but no other information, you need the ZP4 DVD-ROM, which can identify all address records having a given ZIP + 4 code.

  • To validate a specific mailing address (not just confirm the address falls within the low-to-high house number range for a ZIP + 4 code), you need the ZP4 DVD-ROM.

  • If your browser won't display the entire pop-up list of state abbreviations, you're probably using Unix software that can't display scrollable pop-up lists like most Windows or Macintosh browsers. Try another browser, or this alternate form, or include any ZIP Code for the city containing the address.

  • Don't know the difference between MA, MD, ME, MI, MN, MO, MP, MS, and MT? See the list of state abbreviations.

  • Questions or comments? Contact Semaphore Corporation.

  • Find an address.
  • How to get your own copy of the address database.
    Semaphore Corporation is a non-exclusive licensee of the United States Postal Service®. The prices of Semaphore Corporation products are not established, controlled or approved by the Postal Service. The following trademarks are owned by the United States Postal Service: Post Office, ZIP, ZIP Code, ZIP + 4, Postal Service, and United States Postal Service. [DA#4.07]