National Phone Number Registry NPNR

Area Codes in Colorado

The complete list of all valid area codes in Colorado.

Enter the complete 10-digit phone number
Area Code State Country
303 CO - Colorado US
719 CO - Colorado US
720 CO - Colorado US
970 CO - Colorado US

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Some useful links:
National Do Not Call Registry FTC - Cell Phones and the Do Not Call Registry FCC - Do Not Call List FTC Complaint Assistant 1.3.4