Definitions and classifications sourced from the US Library of Congress, MARC Standards Office, MARC Code list for Geographic Areas.

Please Note:

1. Entries listed on “Deprecated” tabs have been discontinued by MARC Standards, and are included only for potential backwards compatibility with externally sourced data.  MDB indexing uses active codes only.
2. MDB may add new codes to the MARC standard codes in order to give finer detail to locations. Additional MDB codes are flagged in the “MDB” column on each tab.