The area of Olompali State Historic Park is 2,832,799.49568 square meters.
The area of The Barnacle Historic State Park is 20,234.282112 square meters.
The area of Columbia State Historic Park is 1,104,791.8033152001 square meters.
The area of Empire Mine State Historic Park is 3,451,968.5283072 square meters.
The area of Fort Ross State Historic Park is 13.731 square kilometers.
The area of Anderson Marsh State Historic Park is 5,252,819.6362752 square meters.
The area of Historic Mill Creek State Park is 2,529,285.264 square meters.
The area of California Citrus State Historic Park is 1,003,620.3927552 square meters.
The area of Sanilac Petroglyphs Historic State Park is 971,245.541376 square meters.
The area of Cambridge Junction Historic State Park is 323,748.513792 square meters.
The area of Colonel Allensworth State Historic Park is 15.034 square kilometers.
The area of Fort Humboldt State Historic Park is 72,843.4156032 square meters.
The area of Dade Battlefield Historic State Park is 323,748.513792 square meters.