Annadel State Park was created in 1971.

The area of Annadel State Park is 20.607 square kilometers.

I don't know but that's the same question I have

Washington State has 142 State Parks, They are listed below.

Alta Lake State Park

Anderson Lake State Park

Battle Ground Lake State Park

Bay View State Park

Beacon Rock State Park

Belfair State Park

Birch Bay State Park

Blake Island State Park

Blind Island State Park

Bogachiel State Park

Bottle Beach State Park

Bridgeport State Park

Bridle Trails State Park

Brooks Memorial State Park

Cama Beach State Park

Camano Island State Park

Camp Wooten ELC

Cape Disappointment State Park

Centennial Trail State Park

Clark Island State Park

Columbia Hills

Columbia Plateau Trail

Conconully State Park

Crawford State Park

Curlew Lake State Park

Cutts Island State Park

Damon Point State Park

Daroga State Park

Dash Point State Park

Deception Pass State Park

Dosewallips State Park

Doug's Beach State Park

Eagle Island State Park

Fay Bainbridge State Park

Federation Forest State Park

Fields Spring State Park

Flaming Geyser State Park

Fort Casey State Park

Fort Columbia State Park

Fort Ebey State Park

Fort Flagler State Park

Fort Okanogan State Park

Fort Simcoe State Park

Fort Townsend State Park

Fort Ward State Park

Fort Worden State Park

Ginkgo Petrified Forest State Park

Goldendale Observatory State Park

Grayland Beach State Park

Griffin Bay State Park

Griffiths-Priday State Park

Hope Island State Park (Mason)

Hope Island State Park (Skagit)

Ike Kinswa State Park

Illahee State Park

Iron Horse State Park

James Island State Park

Jarrell Cove State Park

Joemma Beach State Park

Jones Island State Park

Joseph Whidbey State Park

Kanaskat-Palmer State Park

Kinney Point State Park

Kitsap Memorial State Park

Kopachuck State Park

Lake Chelan State Park

Lake Easton State Park

Lake Sammamish State Park

Lake Sylvia State Park

Lake Wenatchee State Park

Larrabee State Park

Leadbetter Point State Park

Lewis & Clark State Park

Lewis & Clark Trail State Park

Lime Kiln Point State Park

Lincoln Rock State Park

Manchester State Park

Maryhill State Park

Matia Island State Park

McMicken Island State Park

Millersylvania State Park

Moran State Park

Mount Pilchuck State Park

Mount Spokane State Park

Mystery Bay State Park

Nine Mile Recreation Area

Nolte State Park

Ocean City State Park

Olallie State Park

Olmstead Place State Park

Osoyoos Lake State Park

Pacific Beach State Park

Pacific Pines State Park

Palouse Falls State Park

Paradise Point State Park

Patos Island State Park

Peace Arch State Park

Pearrygin Lake State Park

Penrose Point State Park

Peshastin Pinnacles State Park

Pleasant Harbor State Park

Posey Island State Park

Potholes State Park

Potlatch State Park

Rainbow Falls State Park

Rasar State Park

Reed Island State Park

Riverside State Park

Rockport State Park

Sacajawea State Park

Saint Edward State Park

Saltwater State Park

Scenic Beach State Park

Schafer State Park

Seaquest State Park

Sequim Bay State Park

Shine Tidelands State Park

Skagit Island State Park

South Whidbey State Park

Spencer Spit State Park

Spring Creek Hatchery

Squak Mountain State Park

Squilchuck State Park

Steamboat Rock State Park

Steptoe Battlefield State Park

Steptoe Butte State Park

Stuart Island State Park

Sucia Island State Park

Sun Lakes State Park

Tolmie State Park

Triton Cove State Park

Turn Island State Park

Twanoh State Park

Twenty-Five Mile Creek State Park

Twin Harbors State Park

Upright Channel State Park

Wallace Falls State Park

Wanapum Recreational Area

Wenatchee Confluence State Park

Wenberg State Park

Westport Light State Park

Yakima Sportsman State Park

Washington State has 142 state parks

Alta Lake State Park

Anderson Lake State Park

Battle Ground Lake State Park

Bay View State Park

Beacon Rock State Park

Belfair State Park

Birch Bay State Park

Blake Island State Park

Blind Island State Park

Bogachiel State Park

Bottle Beach State Park

Bridgeport State Park

Bridle Trails State Park

Brooks Memorial State Park

Cama Beach State Park

Camano Island State Park

Camp Wooten ELC

Cape Disappointment State Park

Centennial Trail State Park

Clark Island State Park

Columbia Hills

Columbia Plateau Trail

Conconully State Park

Crawford State Park

Curlew Lake State Park

Cutts Island State Park

Damon Point State Park

Daroga State Park

Dash Point State Park

Deception Pass State Park

Dosewallips State Park

Doug's Beach State Park

Eagle Island State Park

Fay Bainbridge State Park

Federation Forest State Park

Fields Spring State Park

Flaming Geyser State Park

Fort Casey State Park

Fort Columbia State Park

Fort Ebey State Park

Fort Flagler State Park

Fort Okanogan State Park

Fort Simcoe State Park

Fort Townsend State Park

Fort Ward State Park

Fort Worden State Park

Ginkgo Petrified Forest State Park

Goldendale Observatory State Park

Grayland Beach State Park

Griffin Bay State Park

Griffiths-Priday State Park

Hope Island State Park (Mason)

Hope Island State Park (Skagit)

Ike Kinswa State Park

Illahee State Park

Iron Horse State Park

James Island State Park

Jarrell Cove State Park

Joemma Beach State Park

Jones Island State Park

Joseph Whidbey State Park

Kanaskat-Palmer State Park

Kinney Point State Park

Kitsap Memorial State Park

Kopachuck State Park

Lake Chelan State Park

Lake Easton State Park

Lake Sammamish State Park

Lake Sylvia State Park

Lake Wenatchee State Park

Larrabee State Park

Leadbetter Point State Park

Lewis & Clark State Park

Lewis & Clark Trail State Park

Lime Kiln Point State Park

Lincoln Rock State Park

Manchester State Park

Maryhill State Park

Matia Island State Park

McMicken Island State Park

Millersylvania State Park

Moran State Park

Mount Pilchuck State Park

Mount Spokane State Park

Mystery Bay State Park

Nine Mile Recreation Area

Nolte State Park

Ocean City State Park

Olallie State Park

Olmstead Place State Park

Osoyoos Lake State Park

Pacific Beach State Park

Pacific Pines State Park

Palouse Falls State Park

Paradise Point State Park

Patos Island State Park

Peace Arch State Park

Pearrygin Lake State Park

Penrose Point State Park

Peshastin Pinnacles State Park

Pleasant Harbor State Park

Posey Island State Park

Potholes State Park

Potlatch State Park

Rainbow Falls State Park

Rasar State Park

Reed Island State Park

Riverside State Park

Rockport State Park

Sacajawea State Park

Saint Edward State Park

Saltwater State Park

Scenic Beach State Park

Schafer State Park

Seaquest State Park

Sequim Bay State Park

Shine Tidelands State Park

Skagit Island State Park

South Whidbey State Park

Spencer Spit State Park

Spring Creek Hatchery

Squak Mountain State Park

Squilchuck State Park

Steamboat Rock State Park

Steptoe Battlefield State Park

Steptoe Butte State Park

Stuart Island State Park

Sucia Island State Park

Sun Lakes State Park

Tolmie State Park

Triton Cove State Park

Turn Island State Park

Twanoh State Park

Twenty-Five Mile Creek State Park

Twin Harbors State Park

Upright Channel State Park

Wallace Falls State Park

Wanapum Recreational Area

Wenatchee Confluence State Park

Wenberg State Park

Westport Light State Park

Yakima Sportsman State Park

Here is a list of Pennsylvania's State Parks:

Allegheny Islands State Park

Archbald Pothole State Park

Bald Eagle State Park

Beltzville State Park

Bendigo State Park

Benjamin Rush State Park

Big Pocono State Park

Big Spring State Forest Picnic Area

Black Moshannon State Park

Blue Knob State Park

Boyd Big Tree Preserve Conservation Area

Buchanan's Birthplace State Park

Bucktail State Park Natural Area

Caledonia State Park

Canoe Creek State Park

Chapman State Park

Cherry Springs State Park

Clear Creek State Park

Codorus State Park

Colonel Denning State Park

Colton Point State Park

Cook Forest State Park

Cowans Gap State Park

Delaware Canal State Park

Denton Hill State Park

Elk State Park

Erie Bluffs State Park

Evansburg State Park

Fort Washington State Park

Fowlers Hollow State Park

Frances Slocum State Park

French Creek State Park

Gifford Pinchot State Park

Gouldsboro State Park

Greenwood Furnace State Park

Hickory Run State Park

Hillman State Park

Hills Creek State Park

Hyner Run State Park

Hyner View State Park

Jacobsburg Environmental Education Center

Jennings Environmental Education Center

Joseph E. Ibberson Conservation Area

Kettle Creek State Park

Keystone State Park

Kings Gap Environmental Education and Training Center

Kinzua Bridge State Park

Kooser State Park

Lackawanna State Park

Laurel Hill State Park

Laurel Mountain State Park

Laurel Ridge State Park

Laurel Summit State Park

Lehigh Gorge State Park

Leonard Harrison State Park

Linn Run State Park

Little Buffalo State Park

Little Pine State Park

Locust Lake State Park

Lyman Run State Park

Marsh Creek State Park

Maurice K. Goddard State Park

McCalls Dam State Park

McConnells Mill State Park

Memorial Lake State Park

Milton State Park

Mont Alto State Park

Moraine State Park

Mt. Pisgah State Park

Nescopeck State Park

Neshaminy State Park

Nockamixon State Park

Nolde Forest Environmental Education Center

Norristown Farm Park

Ohiopyle State Park

Oil Creek State Park

Ole Bull State Park

Parker Dam State Park

Patterson State Park

Penn-Roosevelt State Park

Pine Grove Furnace State Park

Poe Paddy State Park

Poe Valley State Park

Point State Park

Presque Isle State Park

Prince Gallitzin State Park

Promised Land State Park

Prompton State Park

Prouty Place State Park

Pymatuning State Park

R. B. Winter State Park

Raccoon Creek State Park

Ralph Stover State Park

Ravensburg State Park

Reeds Gap State Park

Ricketts Glen State Park

Ridley Creek State Park

Ryerson Station State Park

S. B. Elliott State Park

Salt Springs State Park

Samuel S. Lewis State Park

Sand Bridge State Park

Shawnee State Park

Shikellamy State Park

Sinnemahoning State Park

Sizerville State Park

Susquehanna State Park

Susquehannock State Park

Swatara State Park

Tobyhanna State Park

Trough Creek State Park

Tuscarora State Park

Tyler State Park

Upper Pine Bottom State Park

Varden Conservation Area

Warriors Path State Park

Whipple Dam State Park

White Clay Creek Preserve

Worlds End State Park

Yellow Creek State Park