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Denver Inbound International Dialing
To make an international telephone call to Denver, Colorado from any country worldwide, please follow the dialing procedure shown below.
United States has highly standardized phone numbers, so the dialing steps are the same whether you are dialing a Denver landline phone or a Denver mobile phone
To dial a Denver phone number, you will need:
Click here for dialing steps by country.
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.
1. Dial international access code / IDD: ddd
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
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
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.
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