Hello I have not lived with my husband in four years.
Since he's had a son by another woman and living
His life. I want to get an annulment or divorce but
Don't have his address. How can I get out of this sticky
Situation

See if you can apply for an irretrievable break-down of marriage in your state. This requires nothing but a name of the husband, and it doesn't require a signature from him.

XenoSapien

You don't necessarily need his address to get a divorce. The courts will try to find him, but a divorce can be issued without his signature if they can't find him anyway, my sister did that!

You'll have to make a good faith attempt to locate him. But if you cannot then the divorce can proceed without him.