Currently for Bulgaria, ISO 3166-2 codes are defined for 28 districts.
Each code consists of two parts, separated by a hyphen. The first part is BG, the ISO 3166-1 alpha-2 code of Bulgaria. The second part is two digits (01–28). The codes are assigned in Bulgarian alphabetical order.
Current codes
Subdivision names are listed as in the ISO 3166-2 standard published by the ISO 3166 Maintenance Agency (ISO 3166/MA).
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^For reference only, Bulgarian name in Cyrillic script not included in the ISO 3166-2 standard.
Changes
The following changes to the entry have been announced by the ISO 3166/MA since the first publication of ISO 3166-2 in 1998. ISO stopped issuing newsletters in 2013.
New subdivision layout: Nine regions with former names (two remaining with former code). Ten regions with new names. New references for list source, code source and romanization system
Subdivision layout: 9 regions(see below) → 28 regions