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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.

How to Create a Zip Code Map with Maptive Step #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. ... Step #4: Now, paste your data into the input area or upload your Excel spreadsheet data or import a Google sheet.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

Mapline's zip code mapping tool makes it easy to add a territory such as states, counties, or zip codes on a map. But what's even better is that you can click on any territory (such as a specific county) to see a list of all the locations inside that territory shape!

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.

Leave one space between the city and state and two spaces between the state and ZIP Code?. Use black ink on white or light-colored paper. Use a PO Box? address or street address?but not both.