The Llano County Courthouse and Jail were erected separately, but added to the National Register of Historic Places in Texas on December 2, 1977, as one entry.

The jail was erected in 1895, with the prisoner cells on the second and third floors, and the ground level solely for the office and living accommodations for the sheriff and his family.

[2] The courthouse was designated a Recorded Texas Historic Landmark 1980, Marker number 9446.

Jones and builder J. K. Finely erected the $1550 a temporary courthouse in 1880, pending the construction of a permanent structure.

A. and G. H. Wilson of Sulphur Springs, Texas, was awarded the contract for a brick building trimmed with granite, at a cost of $47,000.

The tower with colonnades and cupola was placed in the southwest corner, accessible only on the south and west.

Hull, and built in 1895 by the Pauly Jail Building and Manufacturing Company of St Louis, Missouri.