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A zip code's influence on the health of those living there is multifold. Where you live directly affects your health in a number of ways, from exposure to air pollution and toxins to accessibility of healthy food, green space and medical care.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west.

The lowest ZIP Code number is 00501, unique for the Internal Revenue Service in Holtsville, NY.

Up to 60% of your health is determined solely by your zip code. This is largely due to the nature of the communities people reside in, such as whether it has wealth, whether or not there is strong community investment, and whether hospitals and health centers are present, among others.

Places in the US so Remote, They Don't Have a ZIP As you can see from the map, not everywhere in the US is assigned a ZIP code. Remote and especially rural areas of the country do not have enough deliverable addresses to create a mail route. Without mail delivery, a ZIP is not needed.

Each ZIP Code is classified as predominately Rural, Urban, or Suburban based on three key factors: population density (people per square mile), distance from nearest city, and size of the nearest city (suburban areas for larger cities extend greater distances).

Nearly every location in the US is in a ZIP code, and ZIP codes are generally well-known to residents of an area. They are also often ? though not always ? geographically coherent, since mail delivery in a given ZIP code is usually served by a single post office.