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5 or 9. 5 gets it to your post office. 9 gets it to your mailbox.

Generally speaking, that is. The problem is that some ZIP codes are assigned to several cities. Take the ZIP code is 62812, for example. It has six Illinois cities assigned to it: Rend City, Benton, Barren, Eastern, Steel City and West City.

The best way to guarantee mail delivery is to use the latest ZIP+4 code. Those extra 4 numbers pinpoint the geographic segment, within a five-digit delivery area, such as: a city block, a group of apartments, a P.O. box or an individual high-volume receiver like a university or the IRS.

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14y ago

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