What is 720 Area Code?

The 720 area code was introduced on September 1, 1998, as an overlay to the original 303 area code. The 303 area code had served the entire state of Colorado since 1947, but rapid population growth and the proliferation of mobile phones in the Denver-Boulder area necessitated a new solution.

As an overlay, both the 720 and 303 area codes serve the exact same geographic region. This requires all local calls to be dialed with a full ten-digit number, a standard practice in major metropolitan areas.

  • State: Colorado
  • Major Cities: Denver, Aurora, Boulder, Lakewood, Littleton
  • Time Zone: Mountain Standard Time (MST) / Mountain Daylight Time (MDT)
  • Established: September 1, 1998
  • Overlay Area Code: 303, 983
  • Region Population: Over 2.8 million (shared with 303 and 983)
  • Primary Uses: Business, Residential

Population & Demographics of 720 Area Code

The 720 area code serves a highly diverse population with a blend of urban, suburban, and mountain communities. The region is a cultural melting pot, attracting a young, educated workforce and a growing number of businesses.

The economy is a powerhouse driven by technology, aerospace, healthcare, and professional services. The presence of major universities and a strong startup scene contributes to a highly educated and innovative workforce, making it a key location for business development.

720 Area Code Time Zone

The 720 area code is located entirely within the Mountain Time Zone (MT). This is a crucial detail for businesses, as it aligns with the Rocky Mountain region's major economic centers and provides a convenient bridge between East and West Coast business hours.