Hartley County Texas has 4 places on the National Register of Historic Places including 4 places of Statewide significance. Significant places include Hartley County Courthouse and Jail, Proctor Pen I(41HT13), Tafoya, Miguel, Place(41HT17) and XIT General Office.
Some of the country's most noteable architects helped create the Hartley County places including Solan & Wilkins and O.G. Roquemore. Prominent architectural styles found in Hartley Country are Classical Revival, Late Victorian and Romanesque.