720 Area Code — Denver, Colorado

Area code 720 serves Denver, CO.

Most looked-up 720 numbers

• 720-639-9165
• 720-589-1828
• 720-989-9982

Phone prefixes in 720

• 720-639
• 720-589
• 720-989

Carriers serving 720

• T-Mobile (1 numbers)
• At&t (1 numbers)
• Teleport Communications Americ (1 numbers)

Frequently asked questions

Where is area code 720?

Area code 720 serves Denver, CO.

What prefixes are in area code 720?

Phone2.io tracks 3 phone prefixes in area code 720, with carrier and spam-report data on individual numbers.

More about area code 720

Area code 720 overview, history, and local numbers · Get a CO phone number

Last updated: May 6, 2026