Washington State Park Highway 21 De Soto, MO 63020 Phone : (636) 586-0322 Business Category Hotels & Motels Campgrounds Parks & Playgrounds Resorts & Vacation Cottages Recreational Vehicle Parks & Campsites Amusement & Recreation Missouri State Of--natural Resources Dept Of, Washington State Park De Soto, MO 63020 Phone : (636) 586-0322 Business Category Hotels & Motels Resorts & Vacation Cottages Missouri State Of--natural Resources Dept Of, State Parks Division Of, Washington State Park Office, Lodging 10033 Washington State Par De Soto, MO 63020 Phone : (636) 586-0322 Business Category Hotels & Motels Resorts & Vacation Cottages