late response to your question
You asked what kind of services are available to the deaf population here. Sorry, I am not on the boards often, but perhaps you are still interested. What I'm going to tell you is not really what services are available, but what services are not available. It's a lot easier.
I work with the deaf in Santo Domingo. Here's the situation. There are only a couple of trained interpreters in the entire country (myself being one of them.) There is no interpreter training or association currently, although they are in the process of setting up an association for future certification and training of interpreters. This means, that interpreting services aren't available to the deaf here. If a deaf person needs an interpreter, one of the teachers of the deaf may be called in to interpret, if it is something serious like court. If it is a doctor's appointment, the deaf person will go alone, or take a friend or family member along to interpret. Almost all interpreting is done gratis, even at the interpreter's expense, because the interpreter usually provides her (his) own transportation.
Education-wise, the vast majority of deaf children in this country do not have the opportunity to go to a school or learn a language. Those who do, for the most part, go to schools with teachers who are unable to communicate effectively with them. No interpreters are provided for any mainstreaming and the miniscule portion of deaf students who manage to make it to college, have no interpreter or tutoring or notetaker services.
On the bright side, more and more deaf students who do go to school are starting younger. They used to always come to me in their teens when it was pretty much too late for them to become fluent in Sign Language. Now some are starting earlier, although there are still a lot of parents who take their kids to school for the first time at nine years old or later.
The government does not provide education for the deaf. All the deaf schools, including the "National School for Deaf-Mutes" are private, although the government does give the larger schools some help. There are many small struggling church schools who are trying to fill in the gaps.
I have met hundreds of deaf people here. I have never met a single deaf person who can read, with the exception of post-lingually deafened, hard of hearing, or the extremely rare oral success; actually I haven't met any oral successes who can read either, but I am fairly confident they exist. Teachers of the deaf will dispute this, because they have students who are able to look at some words and put a sign with them, but it takes little to prove that the student cannot, in fact, read. (Likewise with the typical oral student.)
The next frightening revolution in education is "inclusion." I am hoping, but not at all expecting, that the Dept. of Education will understand that "including" the deaf person in a classroom normally means that the person needs to have support services such as trained interpreters, tutors, and notetakers, which aren't available at any price here. If they just open the door, and throw them in, they are doomed to failure. But I digress.
There is a deaf club, and the very upperclass deaf are even involved in the World Federation of the Deaf.
There is some government work with the handicapped that is including the deaf in some of their work. I haven't seen a lot come out of it yet, but think they have done some good PR work, so they are showing some promise. In theory they will help deaf people get jobs, but in point of fact, either deaf people aren't aware of this, or the agency isn't very good at it.
Deaf people here don't get SSI from the govt., but I have heard of one deaf-blind person that gets a small amount on a regular basis.
There is no requirement for captioning TV, although some shows are captioned since they come in English, and movie theatres usually have open captions, of course, except for children's movies.