The City of Castle Hills incorporated in 1951. The city council is composed of a Mayor and five (5) Aldermen. The Mayor is elected for a two year term on odd-numbered years. Aldermen are elected at-large, for two-year staggered terms, with two elected on odd-numbered years and the remaining three in even-numbered years. A general election is conducted each May for these city officials.
The Mayor is the presiding officer of council and is recognized as head of city government for all legislative and ceremonial purposes. During council meetings, the mayor shall vote only when necessary to break a tie vote.
The council elects from among its members a mayor pro tempore who acts as mayor during the absence of the mayor.