Arkansas is located in the southern part of the United States and is a landlocked state. The land area is 137,539 square kilometers and the population is 2.81 million. The state's capital, Little Rock, is also the largest city with a population of just 180,000. The resource of Arkansas owns diamonds and is one of several cities in the United States that export diamonds. The area code for Arkansas is 501-870, the abbreviated zip code is AR, the zip code for the capital city of Little Rock starts with 72201, and the zip code for Fayetteville starts with 72701.