Colo. Rev. Stat. § 39-22-611
Notwithstanding any other provisions of law, all intangible personal property, whether or not owned by a resident of Colorado, and whether or not such property or evidence thereof is situated or held or has its legal situs within the state, shall be exempt from ad valorem tax imposed by the state of Colorado, or by any political subdivision thereof; but nothing in this section shall be construed to repeal, or in any way affect, the use or inclusion of intangible property other than licenses granted by the federal communications commission to a wireless carrier, as defined in section 29-11-101, C.R.S., as a factor in arriving at the valuation of public utility property assessed by the property tax administrator under provisions of articles 1 to 13 of this title.
C.R.S. § 39-22-611