South Whidbey Island State Park is a 347-acre camping park with 4,500 feet of saltwater shoreline on Admiralty Inlet.
Spencer Spit State Park is a 138-acre marine and camping park situated on Lopez Island in the Strait of Juan de Fuca. The park is named for the lagoon-enclosing sand spit on which it rests.
Spring Creek Hatchery State Park is located in the Columbia River Gorge National Scenic Area, in southeast Skamania County, along the Columbia River.
Squak Mountain State Park is a 1,545-acre day-use park just outside of Issaquah and a short 15-minute drive from Seattle.
Squilchuck State Park is a 288-acre park covered with forests of fir and ponderosa pine. The park sits below Mission Ridge at an elevation of 3,200 feet.
Steamboat Rock State Park is a 3,522-acre camping park with 50,000 feet of freshwater shoreline at the north end of Banks Lake. Dominating the landscape is a columnar, basaltic rock with a surface area of 600 acres.
Steptoe Battlefield is a four-acre, day-use park in Rosalia. This is the site on May 17, 1858, where Lt. Col. E.J. Steptoe led 159 American soldiers in a running fight with a large band of Spokane, Palouse, and Coeur D'Alene Native Americans.
Steptoe Butte State Park is a 150-acre, 3,612-foot-tall natural monument. Thimble-shaped, the quartzite butte looms in bald grandeur over the prevailing flat lands.
Stuart Island State Park is an 85-acre marine camping park with 33,030 feet of shoreline. The park is part of the Cascadia Marine Trail and offers camping and moorage at Reed and Prevost harbors.
Sucia Island State Park is a 564-acre marine park with 77,700 feet of shoreline. Sucia Island is considered the crown jewel of the state's marine park system.
Sun Lakes-Dry Falls State Park is a 4,027-acre camping park with 73,640 feet of freshwater shoreline at the foot of Dry Falls.
Tolmie State Park is a 105-acre marine day-use park with 1,800 feet of saltwater shoreline on Puget Sound. This forested park is on Nisqually Beach a few miles from Olympia, the state's capital city.
Triton Cove State Park is a 29-acre day-use park with 555 feet of saltwater shore on Hood Canal. This small park provides an ADA-accessible boat launch and great views of Hood Canal.
Turn Island State Park is a 35-acre marine camping park with 16,000 feet of shoreline. The island is part of the San Juan National Wildlife Refuge.
Twanoh State Park, situated on the shoreline of Hood Canal, features one of the warmest saltwater beaches in Washington state.
Twenty-Five Mile Creek State Park is a 235-acre inland waters camping park on the forested south shore of Lake Chelan. The park separates the mountains from the lake and is surrounded by spectacular scenery.
Twin Harbors Beach State Park is a 172-acre camping park on the Pacific coast, four miles south of Westhaven.
The Wallace Falls State Park Management Area is a 4,735-acre camping park with shoreline on the Wallace River, Wallace Lake, Jay Lake, Shaw Lake, and the Skykomish River.
Wanapum Recreational Area is part of Ginkgo Petrified Forest State Park and features year-round camping.
Wenatchee Confluence State Park is a 197-acre year-round camping park at the confluence of the Wenatchee and Columbia rivers.
Westport Light State Park is a 212-acre day-use park on the shore of the Pacific Ocean. The park offers a panoramic view of the sea.
Willapa Hills Trail park page.
Yakima Sportsman State Park is a 247-acre camping park created in 1940 by the Yakima Sportsman's Association to promote game management and the preservation of natural resources.