What time zone is area code 720 in?

Area code 720 uses Mountain Time.

What area codes overlay 720?

303 and 983 serve the same area as 720. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.

Is a call from area code 720 a scam?

The area code alone doesn’t tell you. Most calls from 720 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 720 number, let it go to voicemail.

When did area code 720 start?

720 went into service in 1998. It was created from area code 303.

Can a 720 number be outside Colorado?

Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 720 caller can be anywhere.

Area code 720

Where is area code 720?

Denver, Longmont and Fort Lupton, Colorado

Local time: … (Mountain Time)

State	Colorado
Country	United States
Main cities	Denver, Longmont and Fort Lupton
Time zone	Mountain Time
Overlay area codes	303 and 983
In service since	1998 (created from 303)
Assigned prefixes	785
Dialing format	(720) XXX-XXXX · +1 720 XXX XXXX from abroad

Look up a 720 number

Cities and towns in area code 720

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 720.

Phone companies in area code 720

The carriers that hold the most 720 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

Prefixes	Carrier
132	T-Mobile USA
103	Qwest (Lumen)
92	New Cingular Wireless PCS (AT&T)
75	Verizon Wireless
55	Onvoy
55	Bandwidth.com CLEC
51	Mcimetro Access Transmission Services
46	Level 3 Communications

All 785 prefixes in area code 720

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Area codes that overlay 720

Questions

Where is area code 720?: Area code 720 is in Colorado. It serves Denver, Longmont, Fort Lupton, Georgetown and Deckers and 15 other cities and towns.
What time zone is area code 720 in?: Area code 720 uses Mountain Time.
What area codes overlay 720?: 303 and 983 serve the same area as 720. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.
Is a call from area code 720 a scam?: The area code alone doesn’t tell you. Most calls from 720 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 720 number, let it go to voicemail.
When did area code 720 start?: 720 went into service in 1998. It was created from area code 303.
Can a 720 number be outside Colorado?: Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 720 caller can be anywhere.

Other area codes in Colorado

Area code	Main cities
719	Colorado Springs, Pueblo and Cañon City
748	Durango, Eagle and Estes Park
970	Fort Collins, Greeley and Grand Junction