Lao Customs operates regional offices in many towns and cities, including offices located in: Attapeu, Bokeo, Bolikhamsay, Champassack, Huaphanh, Khammuane, Luang Namtha, Luang Prabang, Oudomxay, Phongsaly, Saravanne, Savannnakhet,
The Yang are distributed in the following villages of Phongsaly, Luang Namtha, and Oudomxay provinces (Chazee 1998).