1,800 (2001 SIL). No monolinguals. Ethnic population: 1,800.
Amazonas department: Puerto Santander municipality, 3 enclaves; Ararcuara, La Pedrera on lower Caquetá, Leticia, Mirití-Paraná; Caqueta department: part of westernmost enclave.
None known. In some traditional ceremonies ritual language used, mostly unintelligible even to those who have learned it.
Latin script [Latn].
Local subversive activity caused some Yucuna to move to other areas. Traditional religion, Christian.