The Rockingham County Courthouse is in Brentwood but almost on the Kingston town line. I know the address is a PO Box in Kingston, 03848, but I can't find the box number. In the phone book the address is 10 Route 125, Brentwood, NH 03833. Brentwood doesn't have a post office but uses the Exeter zip code. You might try one or the other. Joyce Davies in Kingston NH