Generally Oklahoma is a region of the United States and this region located in the South Central United States. Oklahoma City is the is the most important city and it is the also capital of Oklahoma. Their spoken languages are English, Spanish, Cherokee and many others but English is their official language. Oklahoma's official population was 3,878,051 in 2014. Its total area is181,195 square kilometers. There are various public universities: Oklahoma State University, the University of Oklahoma, the University of Central Oklahoma, and Northeastern State University are the largest public. Numerous private universities and colleges are also available in Oklahoma. There are many international airports in Oklahoma. The largest commercial airport is named Will Rogers World Airport. The second largest commercial airport is named Tulsa International Airport. Train service is also available in Oklahoma. Ferris and bus services are also found in Oklahoma. Oklahoma is really a pure and beautiful place for tourist.