Texas Election Code - ELEC § 42.007. Combining Incorporated and Unincorporated Territory

(1) cannot constitute a separate election precinct of suitable size or shape that contains the permissible number of voters;  or

(2) cannot be combined with other territory on the same side of the city boundary to form an election precinct of a suitable size or shape that contains the permissible number of voters without causing another election precinct to fail to meet those requirements.