The area of Illinois Beach State Park is 16.835 square kilometers.
McCarthy Beach State Park was created in 1945.
Hammonasset Beach State Park was created in 1920.
Orchard Beach State Park was created in 1921.
Crescent Beach State Park was created in 1966.
Carolina Beach State Park was created in 1969.
Headlands Beach State Park was created in 1953.
Myrtle Beach State Park was created in 1935.
Peacock Beach State Park was created in 2010.
Beaver Dam State Park - Illinois - was created in 1947.
Big Foot Beach State Park was created in 1949.
Henderson Beach State Park was created on 1991-03-29.