ISO 3166-2:FM is the entry for the Federated States of Micronesia 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 for the Federated States of Micronesia, ISO 3166-2 codes are defined for 4 states.
Each code consists of two parts, separated by a hyphen. The first part is FM, the ISO 3166-1 alpha-2 code of the Federated States of Micronesia. The second part is three letters. The code for Chuuk (FM-TRK) is based on its former name, Truk.