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Add code scheme
A '''ZIP code''' is a five-[[digit]] [[numeric]] [[code]] used by the [[United States Postal Service]] in sorting [[mail]]. The first digit indicates a group of [[state]]s; the second and third, a region of a state or a large [[city]]; and the fourth and fifth, a small [[town]], a delivery area in a larger town or city, a particular postal facility, or a particular large mail recipient. Extensions of the ZIP code include the nine-digit ZIP+4 code and the 11-digit ABC (Advanced Bar Coding) code.
A '''ZIP code''' is a five-[[digit]] [[numeric]] [[code]] used by the [[United States Postal Service]] in sorting [[mail]]. The first digit indicates a group of [[state]]s; the second and third, a region of a state or a large [[city]]; and the fourth and fifth, a small [[town]], a delivery area in a larger town or city, a particular postal facility, or a particular large mail recipient. Extensions of the ZIP code include the nine-digit ZIP+4 code and the 11-digit ABC (Advanced Bar Coding) code.
Zip codes are encoded into barcodes using a redundant binary code and stamped on letters. A "1" (tall line) starts and ends the zip code, and immediately before the final "1" comes a [[checksum]] digit which, when added to all five digits of the zip code, adds to a multiple of 10. The code scheme is chosen so that each digit's binary equivalent has exactly two "1"'s. Digits are encoded as follows:
{| class="wikitable"
|-
|+ '''Numeric values in ZIP code'''
!Digit
!Binary encoding
!Digit
!Binary encoding
|-
|1
|00011
|6
|01100
|-
|2
|00101
|7
|10001
|-
|3
|00110
|8
|10010
|-
|4
|01001
|9
|10100
|-
|5
|01010
|0
|11000
|}
[[Category:United States Government]]
[[Category:United States Government]]