The answer is Tulsa, Oklahoma. While Austin is the capital of Texas, and Jackson is the capital of Mississippi, Tulsa is not a capital city ofany state in the United States. It is the second-largest city in Oklahoma, and it serves as the county seat of Tulsa County, but it is not a state capital. The capital of Oklahoma is actually Oklahoma City, which is the largest city inany U.S. state. However, the capital of Oklahoma is Oklahoma City. Tulsa is the second-largest city in Oklahoma and is known for its arts and culture scene, as well as its history in the oil industry.