The United States Postal Service has a tool to find ZIP codes on its official website. Enter the street address and city name and select the state to find the zip code for that address.
Select Quick Tools from the main navigation bar on USPS.com. Choose Look Up a Zip Code from the drop-down menu that opens. Type in the address details to look up the ZIP code.
On the tool page you can also find all the ZIP codes for any city. Type in the city name and then select the state. The results show all the ZIP codes and mentions which ones are for specific P.O. boxes and companies or organizations.