Okla. Neighbor is a term used to refer to the three states that border Oklahoma: Kansas, Texas, and Kansas. Kansas is a state located in the Midwestern United States, while Texas is located in the South Central United States. Kansas is the most populous of the three states, with a population of over 2.9 million people. Texas is the second most populous state, with a population of over 28 million people. Both Kansas and Texas are known for their agricultural production, with Kansas being the top wheat-producing state in the United States.