Area code 303
303 is Denver, Boulder, Aurora, Colorado.
Area code 303 at a glance
- State
- Colorado
- Main cities
- Denver, Boulder, Aurora, Lakewood, Littleton, Longmont, Broomfield, Castle Rock
- Time zone
- Mountain Time
- Local time now
- --:--:--
- In service since
- 1947
720 covers the exact same area as 303 — both are dialed with all 10 digits.
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Call any 303 number from your browser — no SIM, no app install, and no international roaming charge.
Calls to United States start at $0.02/min from QuikRing.
Call now in your browserCalling 303 from inside the US or Canada
Dial 1, then 303, then the 7-digit number.
Calling a 303 number or a 1-800 number from outside the US or Canada? Here is how to reach it from abroad.
Frequently asked questions
Where is area code 303?
Area code 303 covers Denver, Boulder, Aurora in Colorado.
What time is it in area code 303?
Area code 303 is in the Mountain Time time zone. See the live clock above for the current local time.
Is 720 the same area as 303?
Yes. 720 is an overlay of 303 — they cover the exact same area, so every call there needs all 10 digits dialed.
How do I get an area code 303 phone number?
Sign up for QuikRing and rent one of the available 303 numbers shown above. It starts working immediately and can receive real calls and text messages.
How much does it cost to call 303 from abroad?
Calls to United States numbers, including area code 303, start at $0.02/min with QuikRing — no roaming plan or SIM needed.