🇺🇸 United States · Colorado

Area code 720

Area code 720 is a telephone area code in Colorado, United States, covering Denver, Aurora, Littleton, Highlands Ranch, Boulder, Parker and more. Local time is UTC−7 (UTC−6 in summer). Numbers look like (720) 234-5678, or +1 720 234 5678 from abroad.

State: Colorado
Time zone: Denver UTC−7 (UTC−6 in summer)
Local time now: –
Dial from abroad: +1 720

Places in area code 720

Cities and towns with telephone exchanges in the 720 area code, most exchanges first.

Denver
Aurora
Littleton
Highlands Ranch
Boulder
Parker
Longmont
Brighton
Castle Rock
Broomfield

How to dial area code 720

Calling from	You dial
Inside the 720 area	720 234 5678 (10 digits)
Elsewhere in the US & Canada	1 720 234 5678
Any mobile phone, anywhere	+1 720 234 5678
UK, Europe, India and most countries	00 1 720 234 5678
Australia	0011 1 720 234 5678

Other area codes in Colorado

303 Denver, Aurora 719 Colorado Springs, Pueblo 748 Colorado 970 Fort Collins, Greeley 983 Colorado

Area code 720: FAQ

Where is area code 720?

Area code 720 is in Colorado, United States and serves Denver, Aurora, Littleton, Highlands Ranch, Boulder, Parker. and other places

What time zone is area code 720 in?

Area code 720 is in the America/Denver time zone (UTC−7 (UTC−6 in summer)).

How do I call a 720 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 720 and the seven-digit number. Example: +1 720 234 5678.

Is a call from area code 720 a scam?

Area code 720 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 720 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+17202345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}