Colorado Revised Statutes Constitution of 1876 Art. XIV, § 3. Striking off territory--vote

Except as otherwise provided by statute, no part of the territory of any county shall be stricken off and added to an adjoining county, without first submitting the question to the registered electors of the county from which the territory is proposed to be stricken off;  nor unless a majority of all the registered electors of said county voting on the question shall vote therefor.