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The ISO 3166-2 codes for Norway describe 19 counties (fylke). The first part of the code is the ISO 3166-1 country code NO for Norway, the second part is two-digit-numeric (with trailing zeros). The purpose of this family of standards is to establish a worldwide series of short abbreviations for places, for use on package labels, containers and such. Anywhere where a short alphanumeric code can serve to clearly indicate a location in a more convenient and less ambiguous form than the full place name. US readers may wish to consider them as the equivalent of worldwide zip or postal codes. Within the BambooWeb, the codes from the country pages link to the pages for the locations they identify.
NO-13 does not exist.