Boulder, CO, Passed in 2000
Municipal Code, Title 12 Human Rights
Chapter 1, Prohibition of Discrimination in Housing, Employment, and Public Accommodations
Section 12-1-1 Definitions. "Gender variance" means a persistent sense that a person's gender identity is incongruent with the person's biological sex, excluding the element of persistence for persons under age twenty-one and including, without limitation, transitioned transsexuals.

Denver, CO, Passed in 2001
"Gender Identity" is defined in the ordinance as a person's individual attributes that may not be in accord with one's physical anatomy, chromosomal sex, genitalia or sex assigned at birth.