well u put it like this imma use our county prison for exmple
dauphin county prison
john doe #d78945
501 mall rd.
harrisburg

If he is in a mass prison you write his name, the pirson address and that is it.. if you want you can call the prison he is at.. in massachusetts and ask for his inmate number or go on www.vinelink.com (http://www.vinelink.com)
and try and look it up there

welcome to pto ..