* No official census: There's no worldwide or national census specifically tracking ASL proficiency.
* Varying definitions: What constitutes "knowing" ASL? Is it basic understanding, fluency, or a certain level of competency?
* Hidden Deaf community: Many Deaf individuals and families communicate primarily through ASL and may not be included in traditional surveys.
However, some estimates exist:
* USA: The National Institute on Deafness and Other Communication Disorders (NIDCD) estimates that around 500,000 people in the US are deaf or hard of hearing. Of these, a significant portion likely know ASL.
* Worldwide: While no exact numbers exist, ASL is used primarily in the US and Canada. It's also taught in some schools and universities internationally.
It's important to note that these are just estimates, and the actual number of ASL users is likely much higher.
If you're interested in learning ASL, there are many resources available, including online courses, classes at local community centers, and Deaf organizations.