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How to Create a Zip Code Map with MaptiveStep #1: Sign up for a free Maptive trial account.Step #2: Login and click on Create My First Map.Step #3: Name your map, and add a description. Click Continue.Step #4: Now, paste your data into the input area or upload your Excel spreadsheet data or import a Google sheet.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.The second two digits in the code determine a smaller region within each initial area that translates to a central post office facility for that area.

United States ZIP codes are five numerical digits long.The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

But ZIP codes are not created randomly. There is an order and a structure to this mail system.As you type each successive digit of a ZIP code and see what regions of the United States it describes. For example, if you're typing in 64110 (Kansas City), you can see what parts of the United States begin with '6'.

It is typical for 10-20 new ZIP codes to be created each year - many of which are for military uses.

The Tiniest: 11109 (map) A two-block area across the East River from Manhattan, this ZIP code in Long Island City is among the smallest in the country at a tenth of one square mile. It boasts 1,400 people in that area, though, pushing its residents-per-square mile rate to the top of the list, according to Esri.

ZIP codes are five digits long. The first digit is assigned to a broad geographical area of the United States, ranging from zero in the Northeast to nine in the West. The next two digits pinpoint population concentrations and sectional centers accessible to common transportation networks.