Peace Arch State Park is a unique 20-acre day-use park that lies on the boundary between the United States and Canada.
Pearrygin Lake State Park is a camping park with more than 1,200 acres in the Methow Valley of north central Washington.
Penrose Point State Park is a 152-acre marine and camping park on the shores of Puget Sound. The park has over two miles of saltwater frontage on Mayo Cove and Carr Inlet.
Peshastin Pinnacles State Park is a 34-acre desert park featuring a group of sandstone slabs and spires called "the pinnacles." Climbable spires reach 200 feet into the air.
Pleasant Harbor is an overnight moorage facility only. It features 120 feet of moorage dock, and boaters may stay up to three consecutive nights.
Posey Island State Park is a small, one-acre marine camping park with 1,000 feet of shoreline. It is located a quarter mile north of Pearl Island, near Roche Harbor, San Juan Island.
Potholes State Park is a 640-acre camping park with 6,000 feet of freshwater shoreline on Potholes Reservoir. Potholes Reservoir is often confused with the Pothole Lakes themselves, which are a 30- to 45-minute drive from the park.
Potlatch State Park is a 57-acre camping park with 5,700 feet of saltwater shoreline on Hood Canal.
Rainbow Falls State Park is a 139-acre camping park with 3,400 feet of freshwater shoreline on the Chehalis River.
Rasar State Park is a 169-acre camping park with 4,000 feet of freshwater shoreline on the Skagit River.
Reed Island State Park is a 510-acre marine park located east of Vancouver. The island offers bird watching, boating, beach walking, camping, and picnicking.
Riverside State Park is a 14,000-acre camping park along the Spokane and Little Spokane rivers in Eastern Washington.
Rockport State Park is a 670-acre park in an ancient forest.
Sacajawea State Park is a 284-acre inland waters, day-use park at the confluence of the Snake and Columbia rivers.
Saddlebag Island (including Dot Island) is a 24-acre marine park located in Padilla Bay with 6,750 feet of shoreline.
Saint Edward State Park is a 316-acre day-use park with 3,000 feet of freshwater shoreline on Lake Washington.
Saltwater State Park is a camping park featuring 1,445 feet of saltwater shoreline on Puget Sound, halfway between the cities of Tacoma and Seattle.
Scenic Beach State Park is an 88-acre camping park with 1,500 feet of saltwater beachfront on Hood Canal.
Schafer State Park is a 119-acre camping park on the Satsop River, midway between Olympia and Ocean Park.
Seaquest State Park is a 475-acre, year-round camping park near Mount St. Helens.
Sequim Bay State Park is a year-round, 92-acre marine camping park with 4,909 feet of saltwater coast in the Sequim "rainshadow," just inside Puget Sound on the Olympic Peninsula.
Shine Tidelands State Park is a 13-acre day-use park with 5,000 feet of tideland along Bywater Bay.
Skagit Island State Park is a 24-acre marine camping park in Skagit Bay.