Do you have to have a Colorado Id to get a Library card here

From library website: Acceptable photo IDs Driver's license, provisional license, international license or student license ID card from the Department of Motor Vehicles Alien Registration Card Military or school identification, or a passport. It must be current and valid Acceptable proof of current Colorado address Driver's license, provisional license, international license or student license ID card from the Department of Motor Vehicles Utility deposit receipt or bill Voter registration Official rent receipt or rental Postmarked mail with your name on it https://www.poudrelibraries.org/borrow/

You need to show proof of residency within the Poudre library district; a bill or lease will work.