The Four State Area is a term used to describe the four corner region of Arkansas , Kansas , Missouri and Oklahoma with the Joplin , Missouri and Fayetteville-Springdale-Rogers , Arkansas metropolitan areas included within . The Four State Area is a term used to describe the four corner region of Arkansas , Kansas , Missouri and Oklahoma with the Tulsa , Oklahoma Joplin , Missouri and Fayetteville-Springdale-Rogers , Arkansas metropolitan areas included within .