C.R.S. § 31-1-203

(1) With respect to the exercises of certain municipal and corporate powers, granted by the provisions of this title, and to the duties of certain municipal officers, set forth in this title, all municipal corporations organized pursuant to the provisions of this title or of any other general law on or after July 3, 1877, which have not chosen to adopt a home rule charter under the provisions of article XX of the state constitution, are divided into cities and towns. (2) Repealed.