Denver Dialing Codes - At a Glance

Below is a recap of the important dialing codes you may need for making calls to, from, or within Denver.

Follow links for additional information on any code - or to look up that code for other countries.

National long distance code (NDD):
303, 720, more...

Denver phone numbers are 10-digits long consisting of a 3-digit area code and a 7-digit local subscriber number. The phone number format is the same for both landline and mobile phones.

Additional Denver dialing and calling information is provided throughout this site.

Denver dialing instructions
Denver phone numbers
Recommended calling cards

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