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Although most ZIP Codes can be roughly assigned to a geographic area, ZIP Codes do not represent geographic regions. ZIP Codes denote street address groups or delivery routes. Because of this, ZIP Code "areas" can overlap, be contained within another ZIP Code, or have no geographic area.

Also called ?plus-four codes?, ?add-on codes?, or ?add-ons?, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

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.

As mentioned earlier, there are a few ZIP Codes that deliver across state lines, and there are a few ZIP/sectors that cross county lines. There are 153 ZIP Codes in more than one state. There are 9,000 ZIP Codes in more than one county. There were 11,331 (out of the total 857,400) ZIP/sectors that were split by county.

This is because ZIP code boundaries are based on mail routes and delivery points rather than geographic factors. The U.S. Post Office Department, predecessor to USPS, developed a zoning address system in 1943 as a way to make sorting and delivery of mail easier.

It is preferred that all City, State, and ZIP Code information be on a single line. If that is not possible, the ZIP Code, including the ZIP+4 Code, may be placed below the city/state information.

People living just a few blocks apart may have vastly different opportunities to live a long life. Unfortunately, significant gaps in life expectancy persist across many United States cities, towns, ZIP codes and neighborhoods. The latest estimates of life expectancy reveal differences down to the census tract level.