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Look up address and ZIP codes on USPS.com by accessing the site's ZIP code search tool and entering the available information into the designated fields. The tool allows you to find the ZIP code associated with an address as well as the ZIP codes within a given city.How to find USPS ZIP codes?
Click the " Find by Address " button on the USPS tool and type the full street address with city and state at a minimum. You can also enter the company name and any suite or floor number. Click " Find " to see the USPS-formatted address with the five-digit ZIP Code and its extra four digits.How do you look up a ZIP code?
Find the ZIP code of an exact address by visiting USPS.com and clicking on the Look Up a ZIP Code button under the Quick Tools main menu option. On this page, enter in the street address and unit or apartment number along with the city and state in which the address exists.What is the lowest ZIP code in the United States?
The lowest in-use zip code is 00501 and it belongs to the IRS mail processing center located in Holtsville, New York. Conversely, the highest in-use zip code, 99950, belongs to the city of Ketchikan, Alaska.