Texas Election Code - ELEC § 33.031. General Eligibility Requirements

(1) of the county in which the person is to serve, in an election ordered by the governor or a county authority or in a primary election;

(2) of the part of the county in which the election is held, in an election ordered by the governor or a county authority that does not cover the entire county of the person's residence;  and

(3) of the political subdivision, in an election ordered by an authority of a political subdivision other than a county.