Town of Rockville Centre has them for Mercy Hospital. They will produce a new one and send it to you for a small fee
My brother was born in this hospital, he had to go Village hall in Rockville centre because they are an incorporated village. Address is 1 College Pl, Rockville Centre, NY 11570
Birth certificates can be obtained through the Town Clerk's Office. In this case, you would need to go to the Town of Hempstead.
Can I come to the hospital (Mercy Hospital where I was born 69 years ago and get my birth certificate?
Thanks! Your answer is awaiting moderation.