AA - Approved by competent national government agency
AC - Approved by Customs Authority
AF - Approved by national facilitation body
AI - Code adopted by international organisation (IATA, ECLAC, EUROSTAT, etc.)
AM - Approved by the UN/LOCODE Maintenance Agency
AQ - Entry approved, functions not verified
AS - Approved by national standardisation body
QQ - Original entry not verified since date indicated
RL - Recognised location - Existence and representation of location name confirmed by check against nominated gazetteer or other reference work
RN - Request from credible national sources for locations in their own country
RQ - Request under consideration
RR - Request rejected
UR - Entry included on user's request; not officially approved
XX - Entry that will be removed from the next issue of UN/LOCODE
You can use the search function above to enter city names to find the UN/LOCODE. Or you can search for the UN/LOCODE of corresponding Japan cities by region.