Colorado Revised Statutes Title 31. Government Municipal § 31-35-503. Oath--officers

Each commissioner, before assuming the duties of his office, shall take and subscribe an oath or affirmation before an officer authorized to administer oaths that he will support the constitutions and laws of the United States and of this state and that he will faithfully and impartially discharge the duties of his office to the best of his ability. Such oath or affirmation shall be filed in the office of the clerk or secretary of the municipality.