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  2. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    List showing the geographical location of the first three digits of the Social Security numbers assigned in the United States and its territories from 1936 until June 25, 2011. Repeated numbers indicate that they have been transferred to another location or are shared by more than one location.

  3. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The first three digits of the postal code are required; the last two or three digits are optional. Codes are known as yóu dì qū hào (郵遞區號), and are also assigned to Senkaku Islands (Diaoyutai), though Japanese-administered, Pratas Island and the Spratly Islands. NNN-NNN 3+3 digit codes were launched on March 3, 2020.

  4. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...

  5. Template:Three-digit ZIP Code table - Wikipedia

    en.wikipedia.org/wiki/Template:Three-digit_ZIP...

    This page was last edited on 16 December 2019, at 06:17 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. Social insurance number - Wikipedia

    en.wikipedia.org/wiki/Social_insurance_number

    Social Insurance Numbers can be validated through a simple check digit process called the Luhn algorithm. 046 454 286 <--- A fictitious, but valid, SIN. 121 212 121 <--- Multiply every second digit by 2. The result of the multiplication is: 0 8 6 8 5 8 2 16 6 Then, add all of the digits together (note that 16 is summed as the individual digits ...

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  8. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    The purpose, rather than to standardize state abbreviations per se, was to make room in a line of no more than 23 characters for the city, the state, and the ZIP code. [4] Since 1963, only one state abbreviation has changed.

  9. Postal address verification - Wikipedia

    en.wikipedia.org/wiki/Postal_address_verification

    If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.