State of Oklahoma which is part of the United States, was founded in Nov. 16, 1907. Oklahoma occupies the 20 place in terms of total area of the US. The area of the state is 181 038 square kilometers. The capital of Oklahoma is Oklahoma City. The population of Oklahoma amounts to 3 923 561 people and ranks 28 in terms of population of the US. The largest city of the state is Oklahoma City. Our catalog contains 84 cities and 98 018 enterprises located in this state. Postal abbreviation or short name is OK.