Newport County Chamber of Commerce Share: Newport County Chamber of Commerce Visit Website 35 Valley Rd Middletown, RI 02842 (401) 847-1600 About Map About The Newport County Chamber of Commerce is one of Rhode Island's largest business advocacy organizations formed to enhance the business, civic and economic vitality of Newport County and greater Rhode Island. What's Nearby? Distance: 5 10 15 20 25 50 mi.