30579 Original Bangkok Sign Language 100-999 0 0 ~495 "Since there has never been a census of deaf people in Bangkok, the real number of signers is unknown. However, some estimate of the number of signers can be made... Using United Nations estimates for urban areas of 1 person out of every 1,000 person born profoundly deaf or becoming profoundly deaf at an early age, there would be an estimate of 495 deaf people over the age of sixty-five living in the area where OBSL is used." Original Bangkok Sign Language On ~495 100-999