Tex. Tax Code § 321.107
The imposition, computation, administration, enforcement, and collection of any local sales and use tax imposed by any other local governmental entity is governed by this chapter, except as otherwise provided by law. In this section, "other local governmental entity" includes any governmental entity created by the legislature that has a limited purpose or function, that has a defined or restricted geographic territory, and that is authorized by law to impose a local sales and use tax. The term does not include a county, county health services district, county landfill and criminal detention center district, metropolitan transportation authority, coordinated county transportation authority, economic development district, crime control district, hospital district, emergency services district, or library district.
Tex. Tax Code § 321.107