("TX 18" redirects here. TX 18 may also refer to Texas's 18th congressional district.) State Highway 18, or SH 18, is a state highway in the U.S. state of Texas maintained by the Texas Department of Transportation (TxDOT) that runs from Fort Stockton in western Texas to the Texas-New Mexico state line between Kermit and Jal, New Mexico. This route was designated in 1958 over the northern half of what was previously SH 82.