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The USPS provides a free ZIP+4 code lookup tool on their website that can be used to find accurate and up-to-date ZIP+4 codes for specific addresses. By using this tool, individuals and businesses can ensure that their mail is delivered to the correct location in a timely and efficient manner.

This is because ZIP code boundaries are based on mail routes and delivery points rather than geographic factors. The U.S. Post Office Department, predecessor to USPS, developed a zoning address system in 1943 as a way to make sorting and delivery of mail easier.

ZIP codes have nothing to do with the lines that define a county. One ZIP code could include addresses in multiple counties and a single county might include hundreds of ZIPs!

A 5-digit number that identifies a particular postal delivery area in the United States.

Look Up a ZIP Code ? By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code?. Find by Address. By City and State. Enter city and state to see all the ZIP Codes? for that city. Find by City & State. Cities by ZIP Code? Enter a ZIP Code? to see the cities it covers.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

Also called ?plus-four codes?, ?add-on codes?, or ?add-ons?, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

A ZIP+4 Code uses the basic five-digit code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, a post office box, or any other unit that could use an extra identifier to aid in ...