Law Enforcement Agencies in Brentwood, NH NH › Rockingham County Agencies serving the city of Brentwood in NH. Agency Types in Brentwood County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Brentwood, NH Brentwood Police Department Rockingham County Rockingham County Department of Corrections Rockingham County Rockingham County Sheriffs Department Rockingham County
