Tongdao (the full name: ""Tongdao Dong Autonomous County"", ; usually referred to as ""Tongdao County"", ) is an autonomous county of Dong people in Hunan Province, China, it is under the administration of Huaihua Prefecture-level City. Tongdao is also the 5th least-populous county of the province (after Shaoshan, Guzhang, Shuangpai and Yanling).
 There are four counties in the province (after Shaoshan, Guzhang, Shuangpai and Yanling) which are less populous than Tongdao.

 Tongdao is also the 5th least-populous county which means there are 4 counties less populous than Tongdao.