Texas is the second-largest U.S. state in both area and population, and the largest state in the contiguous United States. The name, meaning "friends" or "allies" in Caddo, was applied by the Spanish to the Caddo themselves and to the region of their settlement in East Texas. Located in the South Central United States, Texas is bordered by Mexico to the south, New Mexico to the west, Oklahoma to the north, Arkansas to the northeast, and Louisiana to the east. Texas has an area of 268,820 square miles (696,200 km2), and a growing population of 24.7 million residents. Houston is the largest city in Texas and the fourth-largest in the United States, while San Antonio is the seventh largest in the United States. Dallas–Fort Worth and Houston are the fourth and sixth largest United States metropolitan areas, respectively. Other major cities include San Antonio, El Paso, and Austin—the state capital. Texas is nicknamed the Lone Star State to signify Texas as an independent republic and as a reminder of the state's struggle for independence from Mexico. The "Lone Star" can be found on the Texas State Flag and on the Texas State Seal today.