Texarkana is a city in the U.S. state of Arkansas and the county seat of Miller County, on the southwest border of the state. As of the 2020 census, it had a population of 29,387. It is the twin city of Texarkana, Texas, located just across the state line. The city was founded at a railroad intersection on December 8, 1873, and was incorporated in Arkansas on August 10, 1880. Texarkana and its Texas counterpart are the principal cities of the Texarkana metropolitan area, which in 2021 was ranked 289th in the United States with a population of 147,174, according to the United States Census Bureau.