Relating to the display of flags by a building owned or operated by the state, a municipality, or a county.

HB 3990 requires state, municipal, and county buildings in Texas to display only three flags: the U.S. flag, the Texas state flag, or the official flag of the local municipality or county. The bill prohibits displaying any other flags, including those representing organizations or causes, at these government-owned or operated facilities. It defines "display" as showing flags where visitors or employees can see them, and mandates that U.S. and state flags must be in official colors without alteration. The law takes effect September 1, 2025, and directly affects all public buildings operated by Texas state, city, or county governments.