What is what area code is 720?

Area code 720 serves the state of <a href="https://www.wikiwhat.page/kavramlar/Colorado">Colorado</a>. Specifically, it's primarily associated with the Denver metropolitan area. It's an overlay area code, meaning it covers the same geographic region as another area code, which in this case is <a href="https://www.wikiwhat.page/kavramlar/Area%20Code%20303">Area Code 303</a>. This overlay was introduced to address the increasing demand for phone numbers in the region. Therefore, even within the area covered by area code 303, new phone numbers may be assigned area code 720. This requires the use of 10-digit dialing (area code + 7-digit number) for all calls within the Denver metro area.