C.R.S. § 7-90-701

(1) Every domestic entity for which a constituent filed document is on file in the records of the secretary of state and every foreign entity authorized to transact business or conduct activities in this state shall continuously maintain in this state a registered agent that shall be: (a) An individual who is eighteen years of age or older whose primary residence or usual place of business is in this state; (b) A domestic entity having a usual place of business in this state; or (c) A foreign entity authorized to transact business or conduct activities in this state that has a usual place of business in this state. (2) An entity having a usual place of business in this state may serve as its own registered agent. (3) Any document delivered to the secretary of state for filing on behalf of an entity that appoints a person as the registered agent for the entity shall contain a statement that the person has consented to being so appointed.