The 12th Judicial District is composed of Grimes, Madison, and Walker counties.

Acts 1985, 69th Leg., ch. 480, Sec. 1, eff. Sept. 1, 1985.

Acts 2013, 83rd Leg., R.S., Ch. 1059 (H.B. 3153), Sec. 1.01(a), eff. September 1, 2013.