How to Call Denver, Colorado

CallingDenver.com provides detailed information for making international long distance telephone calls to Denver, Colorado, USA from any country in the world.

United States phone numbers are highly standardized, so Denver phone numbers follow the same format used throughout the US. Mobile numbers and landline numbers have identical 10-digit formats.

Dial Denver, United States

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Denver Dialing Codes

To make an international phone call to Denver, CO, the following dialing codes will be required.

United States phone numbers are highly standardized and are always 10-digits long. They are almost universally written to include all 10-digits. This makes dialing USA phone numbers a bit easier than in some countries.

Type of Dialing CodeDialing Code FormatFind Dialing Codes
International access code
(specific to your originating country)
ddd Lookup international access codes
United States country codeLookup other country codes
Denver area code
(3-digits; always included in written phone numbers)
aaa Find Denver area codes
Denver landline subscriber numbers
(7-digits; always included in written phone numbers)
nnn nnnn Find Denver phone numbers
Denver mobile subscriber numbers
(7-digits; always included in written phone numbers)
nnn nnnn Find Denver phone numbers

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Phone Number Format for International Calls

To make an international phone call to Denver, you generally will need to dial a phone number formatted as follows:

International Phone Number Format
to Call Denver, CO

dddaaa nnn nnnn 
international
access code
country
code
area
code
local subscriber
number

Taking this general format, you need to plug in the outbound international access code for your originating country and the complete 10-digit phone number in Denver.

In the US, landline numbers and cell phone numbers have identical 10-digit formats.

More information:

More on int'l phone numbers >>>>>

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Landline vs. Mobile Phone Number Formats

In Denver and throughout the US, landline phones and mobile phones have identical phone number formats. Both types of phone numbers are 10-digits long, including a 3-digit area code and a 7-digit subscriber number.

The complete international phone numbers you should use to reach the two types of phones are shown below.

Landline vs. Mobile Phone Number Format
Denver landline phone numbersddd 1 aaa nnn nnnn 
Denver mobile phone numbersddd 1 aaa nnn nnnn 

More on landline vs. mobile dialing >>>>>

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Call Denver from Any Country

To make an international call to Denver, CO, USA, you first need to dial the international access code (aka 'IDD') for your originating country. You can lookup the international access code for your country in the widget below.

Find an International Access Code / IDD
Calling from...
Your IDD
Your IDD will print here

Insert your IDD at the maroon x's below to create a complete international phone number for dialing Denver.

  • Phone number format to call a Denver landline number:
    'ddd 1 aaa nnn nnnn '
  • Phone number format to call a Denver mobile number:
    'ddd 1 aaa nnn nnnn '

Notes:

  • Some countries, e.g., Australia, France, Singapore, use more than one IDD to designate specific carriers, specific countries, or other purposes. Be sure to use the correct code for your carrier or calling plan.
  • A '~' symbol indicates a dialing pause. Dial any numbers before the '~', then wait for tone before continuing to dial.
  • Dial only the numerical digits shown - any other characters are informational only.

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