for females. The per capita income for the MSA was $16,901. Economy Texarkana began as a railroad and lumber center, and developed in the 20th century as a regional agricultural processing, retail, wholesale, and service center. Red River Army Depot and Lone Star Army Ammunition Plant were the largest regional employers from the 1940s through the 1970s. Paper mills near Ashdown and Atlanta, as well as other industrial facilities, brought new jobs to the area in the 1970s. Today the Texarkana area is a diversified economy whose pattern of employment categorized by industry is very similar to the entire state of Arkansas. Geography Texarkana consists of two separate municipal designations: Texarkana, Arkansas, the county seat of Miller County, Arkansas Texarkana, Texas, located in Bowie County, Texas State Line Avenue follows the Texas-Arkansas state line throughout much of Texarkana. The two "sides" of Texarkana are separate only from a political standpoint. Thousands of locals actually live in one state and work in the other. Owing to its divided political nature, Texarkana has two mayors and two sets of city officials; however, the two sides share a federal building, courthouse, jail, post office, labor office, chamber of commerce, water utility, and several other offices. Transportation Texarkana is located at the intersection of Interstate 30 and Interstate 49. It is situated approximately halfway between Dallas, Texas, and Little Rock, Arkansas. Air service Texarkana Regional Airport is located inside the northeastern city limits and is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a primary commercial service airport. The airport covers an area of 964 acres (390 ha) at an elevation of 390 feet (119 m) above mean sea level and it has two runways with asphalt surfaces: Runway 4/22 is 6,601 by 144 feet (2,012 x 44 m) Runway 13/31 is 5,200 by 100 feet (1,585 x 30 m) Highways Major routes in Texarkana include: Interstate 30 Interstate 49 Interstate 369 (Texas) U.S. Route 59 U.S. Route 67 U.S. Route 71 U.S. Route 82 Loop (Texarkana) As of October 2015, new interchanges had been completed at the junctions of I-30/US 59, and I-30/I-49. Interstate 49 had been extended south to Shreveport with its northern extension planned into Kansas City along the U.S. Route 71 corridor. Multiple projects were under construction to relieve the strain on local roadways, including continuous access roads and the expansion of area