Denver Inbound International Dialing

Procedure to Dial Denver, CO from Any Country

Follow this basic dialing procedure to place an international long-distance call from any country worldwide to a landline or mobile phone number in Denver, Colorado.

The procedure outlined below is for direct international dialing from a landline or mobile phone in the home or office.

Additional or different dialing steps may be required when calling Denver using calling card or VoIP service.

1. Dial international access code / IDD:   ddd 

Dial your country's international access code (aka international direct dial code or IDD) to initiate a phone call to Denver.

Lookup your international access code here.

Note that some mobile operators do not require dialing an IDD and/or allow use of substitute characters (such as '+') in lieu of dialing an IDD. As well, in many cases you don't dial an IDD when using a calling card or VoIP service.

2. Dial United States country code: + 1 

Dial country code +1 to reach any location in United States, including Denver. Country codes are also known as ISDs or international subscriber dialing codes.

If your Denver phone number starts with a ' 1 ' - e.g., 1 303 224 1800, don't add a second ' 1 '. Dial just a single ' 1 ' after the international access code.

3. Dial a 10-digit Denver phone number

All Denver phone numbers are 10-digits long with two parts:

a. Dial a 3-digit Denver area code:  aaa 

b. Dial a 7-digit local subscriber number: nnn nnnn

The main Denver area codes are 303, 720 - more Denver area codes

Lookup a Denver phone number

Steps to Dial Denver from a Specific Country

Follow the links below for country-specific dialing instructions for calling Denver landline and mobile phones. These pages include originating country access codes and other information.