U.S. Census population data is acquired and updated by the Colorado Department of Local Affairs (DOLA). Other demographic information and studies are available through the Planning Department of the Town of Telluride. You can contact a planner by calling (970) 728-2170 Monday through Friday 8:00 am to 5:00 pm MST.
The Colorado Department of Local Affairs has detailed demographics information on their website. One other useful site for regional demographics and economic data is sponsored by the Region 10 League for Econcomic Assistance.