Well it is said that 1 out of ever 10 persons is gay lesbian bisexual or transgender. So 10% of the population, and 8.6% of the united states population has some sort of hearing loss, hoh or deaf. Only 412,000 americans are considered to be profoundly deaf in both ears which is about 0.18% of the american population.
So 1 out of ever 10 of those 412,000 people about 41,200 are bisexual, transgendered, gay, or lesbian.
So theres your answer about 41,200 deaf people are in the LGBT community. The figure can change depending on what you consider to be deaf, the statistics i used were for people who were profoundly deaf in both ears, but if you want to also include deaf people that can hear some things just not hear or understand speech, the number of lgbt people is much higher, and if you also want to include hoh people, then the number of gay and lesbian people in the deaf community is very much higher than if you just look at people who are profoundly deaf.
There are so many gay people in the deaf community that they have entire forums devoted to being gay and deaf.
Since both work at the Arkansas school for the deaf, and I am in a lesbian relationship with a deaf person, I can say from knowing a strong population of the deaf community that the number of deaf gay people is really about the same as the number of gay hearing people.