Conlen is an unincorporated community in eastern Dallam County, Texas, United States. According to the Handbook of Texas, the community had a population of 69 in 2000. In 1903, Conlen was established. It was named after Capt. J. H. Conlen, a Spanish-American War veteran who oversaw the construction of the Chicago, Rock Island and Pacific Railroad, wh…Conlen is an unincorporated community in eastern Dallam County, Texas, United States. According to the Handbook of Texas, the community had a population of 69 in 2000. In 1903, Conlen was established. It was named after Capt. J. H. Conlen, a Spanish-American War veteran who oversaw the construction of the Chicago, Rock Island and Pacific Railroad, which traveled through the Texas counties of Sherman, Dallam, and Hartley and connected Liberal, Kansas, with Santa Rosa, New Mexico. Conlen made it through the terrible years of the Dust Bowl and afterward, with the installation of irrigation wells, restored its grain-based economy. In 1940, Conlen had 150 residents and four businesses; by 1948, that number had dropped to 62, and there were only three businesses. In 1990 and 2000, Conlen's population was recorded as 61 and 69, respectively. It went down to 18 in 2017.