Colo. Rev. Stat. § 30-6-107
When the votes cast at the annexation election have been duly canvassed, the county clerk of each of said counties shall transmit the result of said election, as to this question, along with the other returns, to the secretary of state, and if such canvass shows that a majority of the votes cast at said election in each of the said counties was in favor of the question submitted in the respective counties mentioned in section 30-6-106, the secretary of state shall immediately make proclamation thereof, setting forth a description of said territory, as it is described in said notice, plat, and survey, and that by virtue of such majority vote in said counties such territory has been stricken off from the one county, naming it, and annexed to the other county, naming it.
C.R.S. § 30-6-107