![]() An extended ZIP+4 code was introduced in 1983 which includes the five digits of the ZIP code, followed by a hyphen and four additional digits that reference a more specific location. ![]() The +4 on a ZIP code can be changed as frequently as once a month, based on things like how many postal employees are working, who is working what route, etc.Ī ZIP code is a postal code used by the United States Postal Service (USPS) in a system it introduced in 1963. Five-digit ZIP codes also change, but they do so infrequently. Marathon County does not assign this number the USPS does.Ī 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 a specific delivery route - meaning the actual path the mail truck would travel could have changed.īecause they are based on delivery routes instead of more permanent boundaries, the last 4 digits of a complete ZIP code can change often. Whenever a new street or a new block range of addresses are added to the USPS data base, a new +4 may be added. There have been several +4 digit changes as a result of the Marathon County Uniform Addressing Program. The final 4 digits are not required for delivery of your mail and may change frequently. The ZIP+4 code is used and assigned by the United States Postal Service (USPS) for routing purposes. What is a Zip+4 Code and Why May It Change? ![]()
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