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If you have an address or partial address, you can find the zip code through USPS Zip Code Lookup, a tool on the U.S. postal service's website. You can also search by city or state, or find all cities that are part of a particular zip code.

Where you live is one of the most significant components of overall health outcomes and life expectancy. Up to 60% of your health is determined solely by your zip code.

What each number means. The first digit designates a broad area, which ranges from zero for the Northeast to nine for the far West. The two following digits are the code of a central post office facility in that region. The last two digits designate small post offices or postal zones.

Due to an increase in population or to the improve postal operations, the US Postal Service® will occasionally add a new ZIP Code or change ZIP Code boundaries.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Zip Code refers to a postal code, used in a few countries with a postal address to specify the location at which mail is sent. On the other hand, postal code indicates the code used in the postal address, which assists in the sorting the mails for the purpose of delivering them at their exact destination.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.