Is it legal for a census worker to ask your landlord or apartment manger for your census information and for that landlord or apartment manager to release your information without your consent?

No. A census form is suppose to be filled out by the resident of the house or apartment. Unless your living quarters do not have direct access to the the outside and you must exit by walking through you landlords apartment, you are required to fill out your own.

I suggest you ask this question to the Census Bureau their number is 1-866-872-6868