Official historic sites of the state of Texas may be under the supervision of the Texas Parks and Wildlife Department (TPWD) or the Texas Historical Commission (THC).
Sites with multiple historic designations are colored according to their highest designation within the following hierarchy.
| # National Historic Landmark (NHL) |
| † National Register of Historic Places (NRHP) |
| ‡NRHP Historic District (HD) |
| ⁂NRHP HD contributing property |
| ⁕State Antiquities Landmark |
| ⁑Recorded Texas Historic Landmark |
A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500, or roughly three percent, of over 90,000 places listed on the country's National Register of Historic Places are recognized as National Historic Landmarks.
U.S. Route 80 or U.S. Highway 80 (US 80) is a major east–west United States Numbered Highway in the Southern United States, much of which was once part of the early auto trail known as the Dixie Overland Highway. As the "0" in the route number indicates, it was originally a cross-country route, from the Pacific Ocean to the Atlantic Ocean. Its original western terminus was at Historic US 101 in San Diego, California. However, the entire segment west of Dallas, Texas, has been decommissioned in favor of various Interstate Highways and state highways. Currently, the highway's western terminus is at an interchange with Interstate 30 (I-30) on the Dallas–Mesquite city line. Its eastern terminus is in Tybee Island, Georgia near the Atlantic Ocean. Between Jonesville, Texas and Kewanee, Mississippi, US 80 runs parallel to or concurrently with Interstate 20. It also currently runs through Dallas, Texas; Shreveport, Louisiana; Jackson, Mississippi; Montgomery, Alabama; Columbus, Georgia; Macon, Georgia; and Savannah, Georgia.
National Historic Sites of Canada are places that have been designated by the federal Minister of the Environment on the advice of the Historic Sites and Monuments Board of Canada (HSMBC), as being of national historic significance. Parks Canada, a federal agency, manages the National Historic Sites program. As of November 2023, there were 1,005 National Historic Sites, 171 of which are administered by Parks Canada; the remainder are administered or owned by other levels of government or private entities. The sites are located across all ten provinces and three territories, with two sites located in France.
The Texas Historical Commission is an agency dedicated to historic preservation within the U.S. state of Texas. It administers the National Register of Historic Places for sites in Texas.
The Old West Austin Historic District is a residential community in Austin, Texas, United States. It is composed of three neighborhoods located on a plateau just west of downtown Austin: Old Enfield, Pemberton Heights, and Bryker Woods. Developed between 1886 and 1953, the three historic neighborhoods stretch from Mopac Expressway east to Lamar Boulevard, and from 13th Street north to 35th Street. It borders Clarksville Historic District and the West Line Historic District to the south.
Park Road 27 or PR 27 is a Texas park road that runs from Fannin to the Fannin Battleground State Historic Site, which is the site of the Battle of Coleto. PR 27 was originally SH 162 and briefly Spur 91 before gaining its current designation in 1940.
Historic districts in the United States are designated historic districts recognizing a group of buildings, archaeological resources, or other properties as historically or architecturally significant. Buildings, structures, objects, and sites within a historic district are normally divided into two categories, contributing and non-contributing. Districts vary greatly in size and composition: a historic district could comprise an entire neighborhood with hundreds of buildings, or a smaller area with just one or a few resources.
Ranch Road 1 is a Ranch Road located in Gillespie and Blanco counties, in the central region of the U.S. state of Texas. The highway is approximately 6.6 miles (10.6 km) long. It begins at U.S. Route 290 in Stonewall, running along the Pedernales River through Lyndon B. Johnson National Historical Park, the late President Lyndon Johnson's former ranch, and through Lyndon B. Johnson State Park and Historic Site, before terminating at US 290 near Hye. The road, designated in 1963, is the only road in the state that the Texas Department of Transportation (TxDOT) has designated as a "Ranch Road". In the earliest days of the state highway system, the route was a part of State Highway 20, and was later part of US 290 before that highway was relocated to the south.
Recorded Texas Historic Landmark (RTHL) is a designation awarded by the Texas Historical Commission for historically and architecturally significant properties in the U.S. state of Texas. RTHL is a legal designation and the highest honor the state can bestow on a historic structure. Purchase and display of a historical marker is a required component of the RTHL designation process. Because it is a legal designation, owners of RTHL-designated structures must give 60 days' notice before any alterations are made to the exterior of the structure. Changes that are unsympathetic may result in removal of the designation and historical marker. More than 3,600 RTHL structures are spread throughout the state.
A Smithsonian trinomial is a unique identifier assigned to archaeological sites in many states in the United States. They are composed of one or two digits coding for the state, typically two letters coding for the county or county-equivalent within the state, and one or more sequential digits representing the order in which the site was listed in that county. The Smithsonian Institution developed the site number system in the 1930s and 1940s, but it no longer maintains the system. Trinomials are now assigned by the individual states. The 48 states then in the union were assigned numbers in alphabetical order. Alaska was assigned number 49 and Hawaii was assigned number 50, after those states were admitted to the union. There is no Smithsonian trinomial number assigned for the District of Columbia or any United States territory.
Park Road 12 (PR 12) is a short Park Road located in Washington County, in the Gulf Coast region of the U.S. state of Texas. The highway is approximately 0.3 miles (0.48 km) long, and connects Washington-on-the-Brazos State Historic Site to Farm to Market Road 1155 (FM 1155) and the surrounding community of Washington-on-the-Brazos. The highway was designated in 1939, and was shortened in 1970. The designation originally contained all roads within the park.
