ADA, a city of Oklahoma, 85m. S.E. of Oklahoma City; served by the Santa Fe, the Frisco and the Oklahoma City-Ada-Atoka railways. The population, nearly all native whites, increased from 4,349 in 1910 to 11,261 in 193o. Ada is the county seat of Pontotoc county, which produces natural gas and petroleum, cotton, grain, live stock, sweet potatoes, peanuts and alfalfa; and has deposits of rock asphalt, glass sand, pottery clay, lead, zinc and other minerals. The city has cotton gins and compresses; feed and corn-mills; cement, stone-crushing, pottery and glass works; brick-yards and grain elevators. It is the seat of the East Central State teachers college (1909), which in 1926-27 had an enrolment of about 2,400 students. The city was incorporated in 1901. It has a commission form of government.