Texline is a town in northwestern Dallam County, Texas, United States. The population was 511 at the 2000 census. The town is named for its location near the New Mexico-Texas state line. U.S. Highway 87 constitutes the main street of Texline. W.A. Criswell, late veteran pastor of First Baptist Church of Dallas, Texas, was reared in Texline though born in Oklahoma.