ISO 3166-2:GU is the entry for Guam in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
Currently no ISO 3166-2 codes are defined in the entry for Guam.
Guam, an outlying area of the United States, is officially assigned the ISO 3166-1 alpha-2 code GU. Moreover, it is also assigned the ISO 3166-2 code US-GU under the entry for the United States.