MidAmerica Industrial Park ("MAIP") is Oklahoma's largest industrial park. The park is located in Pryor Creek, Oklahoma. Over 80 firms are located within the industrial park including operations of seven Fortune 500 companies, such as Google, DuPont and Nordam.The park was founded in 1960, when the Federal government sold most of the former Oklahoma Ordnance Works to a public trust, the Oklahoma Ordnance Works Authority. It covers 9,000 acres (36 km2).