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State parks are parks or other protected areas managed at the sub-national level within those nations which use "state" as a political subdivision. State parks are typically established by a state to preserve a location on account of its natural beauty, historic interest, or recreational potential. There are state parks under the administration of the government of each U.S. state, some of the Mexican states, and in Brazil. The term is also used in the Australian states of Victoria and New South Wales.  The equivalent term used in Canada, Argentina, South Africa, and Belgium, is provincial park. Similar systems of local government maintained parks exist in other countries, but the terminology varies.
State parks are thus similar to national parks, but under state rather than federal administration. Similarly, local government entities below state level may maintain parks, e.g., regional parks or county parks. In general, state parks are smaller than national parks, with a few exceptions such as the Adirondack Park in New York, Anza-Borrego Desert State Park in California, and Wood-Tikchik State Park in Alaska, the largest state park in the United States.
As of 2014 [update], there were 10,234 state park units in the United States, according to the National Association of State Park Directors (NASPD).  There are some 739 million annual visits to the country's state parks.  The NASPD further counts over 43,000 miles (69,000 km) of trail, 217,367 campsites, and 8,277 cabins and lodges across U.S. state parks.  The largest state park system in the United States is Alaska State Parks, with over 100 sites encompassing 3.3 million acres. 
Many states include designations beyond "state park" in their state parks systems. Other designations might be state recreation areas, state beaches, and state nature reserves. Some state park systems include long-distance trails and historic sites. To encourage tourism in rural areas, several states have simple lodges, inns, hotels, or motels (usually with a restaurant) for lodging at some parks. These typically use "Resort" in the name, such as "_____ Resort State Park" in West Virginia state parks and "_____ State Resort Park" in neighboring Kentucky state parks, which has 17 such resort parks, the most of any state. Other states use the Resort name inconsistently (like DeGray Lake Resort State Park, the only one out of three resorts in Arkansas state parks), or have only one such park ( South Carolina state parks' Hickory Knob State Resort Park), or do not use the designation at all (such as the lodges of Georgia state parks). The term "lodge" may also refer to a hiking lodge, essentially a large cabin for hikers rather than a large facility with private rooms and a restaurant. Other lodging may include yurts and tipis.
Not all parks owned by a state are necessarily part of its state-park system, such as Stone Mountain Park near Atlanta. Conversely, not all state-designated parks are entirely under state ownership, such as Adirondack Park, which uses a model more like the national parks of England and Wales. Some Texas state parks are actually a land lease from the U.S. government, while Mackinac National Park was handed down to become the first one of the Michigan state parks. As with national parks, facilities at state parks are often leased to concessionaires to operate. Breaks Interstate Park is operated under an interstate compact by Virginia state parks, although it is also one of the Kentucky state parks, straddling both sides of the state line. Other multi-state parks are legally two separate parks with the same name and more informal cooperation between them.
The title of oldest state park in the United States is claimed by Niagara Falls State Park in New York, established in 1885.   However several public parks previously or currently maintained at the state level pre-date it.  Indian Springs State Park has been operated continuously by the state of Georgia as a public park since 1825, although it did not gain the title "State Park" until 1931.  In 1864 Yosemite Valley and Mariposa Grove were ceded by the federal government to California  until Yosemite National Park was proclaimed in 1890.  In 1878 Wisconsin set aside a vast swath of its northern forests as "The State Park" but, needing money, sold most of it to lumber companies within 20 years.  The first state park with the designation of "state park" was Mackinac Island State Park in 1895, which was first a national park before being transferred to the state of Michigan. 
Many state park systems date to the 1930s, when around 800 state parks (and several national ones) across the country were developed with assistance from federal job-creation programs like the Civilian Conservation Corps and Works Progress Administration. 
|Wikimedia Commons has media related to State parks.|
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- Alaska State Parks
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- Parker, Eugene Phillip. "When Forests Trumped Parks: The Maryland Experience, 1906-1950." Maryland Historical Magazine (2006) 101#2 pp: 203-224.