Mansfield Hollow State Park 31 Old Willimantic Rd Chaplin, CT 06235 Phone : (860) 455-9057 Business Category Parks & Playgrounds Amusement & Recreation Environmental Protection Department--natural Resources And Recreation, Conservation Education & Firearms Safety, State Parks Forests & Campgrounds, Mansfield Hollow State Park Willimantic, CT 06226 Phone : (860) 455-9057 Business Category Government Offices-State Fire Departments Government Offices State & Local Government Offices & Public Schools