The Old McCulloch County Jail is located in Brady, McCulloch County, in the U.S. state of Texas. It was added to the National Register of Historic Places listings in McCulloch County, Texas in 1975, and became a Recorded Texas Historic Landmark in 1976. In 1963, the Texas Historical Commission designated the geographical center of Texas as being located 5 miles (8.0 km) northwest of Brady. The old jail became the Heart of Texas Historical Museum in 1974. A granite monument to the center of Texas can be found on the grounds of the McCulloch County Courthouse.

Brady is a city in McCulloch County, Texas, United States. Brady refers to itself as the "Heart of Texas", as it is the city closest to the geographical center of the state, which is about 15 miles northeast of Brady. Its population was 5,118 at the 2020 census. It is the county seat of McCulloch County.