Area code 303
Area code 303 is a telephone area code in the North American Numbering Plan. It serves Colorado, the United States.
- 303area code
- COColorado
- UScountry
- 1-Jan-47in service
How to dial a 303 number
From within the United States and Canada, dial 1, then 303, then the seven-digit number. From another country, dial your international access code, then +1 303 and the seven-digit number.
Area code 303 covers the same territory as 720 and 983. When several area codes share one area like this, it is called an overlay.
Other area codes in Colorado
Frequently asked questions
Where is area code 303?
Area code 303 serves Colorado, the United States.
What is the country code for a 303 number?
Numbers with North American area codes use the country calling code +1.