C.R.S. § 31-2-216
31-2-216. Change in classification of municipalities
31-2-216. Change in classification of municipalities. Notwithstanding the provisions of part 2 of article 1 of this title, a town having a population exceeding two thousand may reclassify itself as a city, and a city having a population of two thousand or less may reclassify itself as a town, upon adoption of a home rule charter without otherwise complying with the procedures in said part 2.