26735 Jamaican Country Sign Language 10-99 This number refers only to the adults who use JCS. While some sources list 2,500, that number refers to the number of deaf children in Jamaica, as opposed to the number of people who actually use JCS. Most children use both JCS and Jamaican Sign Language (which is 75%% ASL). Some also use Signed English. A Sociolinguistic Profile of the Jamaican Deaf Community Off 40 10-99