The Colorado Municipal League (CML)  offers copies of ordinances banning retail/recreational marijuana, and ordinances banning “medical marijuana.”

CML also provides a list of CO cities banning marijuana (current as of April 2015), and these two more general information sheets on the issue:

Farther west, the California League of Cities also reproduces a number of ordinances banning “medical marijuana,” although such laws generally do not address retail/recreational sales.