Local Government Code §21.001

(a) The governing body of a general-law municipality that is not divided into wards and that elects its aldermen at large may provide by ordinance for the election of aldermen under a place system. (b) The ordinance must be enacted before the 60th day before the date of the first regular municipal election of aldermen under a place system. (c) As soon as possible after the place system ordinance is enacted, the governing body shall assign place numbers to each alderman's office. (d) When incumbent aldermen's terms of office expire, any candidate for the office of alderman shall file an application for a specific place on the governing body, such as "Alderman, Place No. 1." (e) The ballot for an election under the place system must show each office of alderman as a separate office designated by place number.