Question

What is your address?is it grammatically correct.​

Answer 1

Answer:

Yup this sentence is grammatical crrt.

Answer 2

Yes, it is

if you were to change "what?" to "where?" it will seem as if you are looking for the address instead of asking for it.
-so it should be "where do you live?"

so therefore, "what is your address?" is grammatically correct.