Law Enforcement Agencies in Newcastle, WY WY › Niobrara County Agencies serving the city of Newcastle in WY. Agency Types in Newcastle Adult Institutions 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Newcastle, WY Newcastle Police Department Niobrara County Weston County Detention Center Niobrara County Weston County Sheriffs Office Niobrara County Wyoming Honor Conservation Camp Niobrara County
