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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.

That five-digit zip code is one of the key items data brokers use to link a wealth of public records to what you buy. They can figure out whether you're getting married (or divorced), selling your home, smoke cigarettes, sending a kid off to college or about to have one.

In general, the first three digits designate a sectional center facility, the mail sorting and distribution center for an area. A sectional center facility may have more than one three-digit code assigned to it.

The 9-digit ZIP Code consists of two sections. The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas. ZIP plus 4 codes assist the USPS in effectively sorting and distributing mail.

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.

How to Use the Assessment to Analyze ZIP Code DataSelect an Area to Assess at the ZIP Code level.Select Indicators.Generate the Assessment and Show ZIP Code Data.Download ZIP Code Data.Learn More About ZIP Codes, ZCTAs, and Calculations.

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).