Gallaudet Research Institute over 500,000 deaf people in the United States four million adults over 500,000 deaf people in the United States over 500,000 deaf people in the United States over 500,000 deaf people in the United States Local and Regional Deaf Populations Local and Regional Deaf Populations Local and Regional Deaf Populations Local and Regional Deaf Populations over 500,000 deaf people in the United States Gallaudet University Library - Deaf Statistics by US States four million adults four million adults over 500,000 deaf people in the United States over 500,000 deaf people in the United States Local and Regional Deaf Populations Local and Regional Deaf Populations over 500,000 deaf people in the United States over 500,000 deaf people in the United States