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United States ZIP codes are five numerical digits long. ZIP+ 4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

While a 5 digit zip code will usually get your letter or package to its final destination, those extra 4 digits almost guarantee it. The 6th and 7th digits of a ZIP+4 indicate a ?delivery sector,? like a group of streets, P.O. boxes, a group of buildings, or even a single high-rise building.

R package provides offline data on over 41,000 ZIP codes usable for research analyzing data at the ZIP code level. The package can geocode ZIP code-level data in R without depending on external APIs or services.

Because ZIP+4 codes are based on delivery routes, they change when the postal delivery routes are updated by the USPS. That's why ZIP+4 codes can change as often as once a month, since there are several factors that can result in the USPS updating its delivery routes.

Like British, Irish and Dutch Postcodes, Canada's Postal codes are alphanumeric, consisting of both letters and digits. Canadian ZIP codes are in the XNX NXN format. In this format, X is a letter and N is a digit, and there is a space separating the third and fourth characters.

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

Place the recipient's name on the first line. On the second line, write the building number and street name. Include the city, state and ZIP code on the final line.