The area code 720 is located in Boulder, Colorado.
Area code 720 serves the vibrant city of Boulder and surrounding regions in Colorado. Established in 1998, this area code also covers major cities like:
Boulder, known for its stunning views of the Rockies and its rich outdoor culture, is home to the prestigious University of Colorado. Interestingly, the city is often celebrated for its emphasis on sustainability and wellness, ranking high on "happiest cities" lists. With the Flatirons hiking trails nearby, it’s no wonder folks love to call Boulder home!