Area code 303
Get a 303 phone number
New 303 numbers are no longer being issued. To get a number for Denver, CO, pick an available 720 overlay number below and sign up for AvoCall. It serves the same area and rings exactly like a 303 number. Your new number works for calls and texts on the phone you already own over WiFi or data. Current web pricing is verified at checkout. No second SIM and no new device are required.
- Location
- Denver, CO, Colorado
- Time zone
- Mountain (GMT -7)
The 303 area code covers Denver, CO and nearby Colorado communities.
Numbers available for 303 (Denver, CO) right now
Pulled live from our carrier network. Last updated: August 25, 2026 at 8:28 AM UTC.
New 303 numbers are no longer being issued. Carriers now assign numbers in the 720 overlay, which serves the same Denver, CO area and rings exactly like a 303 number for local callers. Every number below is a 720 number.
Every number requires an AvoCall plan. Current web pricing is verified at checkout, and number availability changes often.
About the 303 area code
Denver, Colorado, is the center of area code 303, which also serves Aurora, Thornton, Westminster, Commerce City, and Brighton, all on Mountain time.
First assigned in 1947 among the earliest codes, 303 has since produced 719 and 970 through splits, while 720 and later 983 were layered over its remaining ground as overlays. Local dialing across the complex uses ten digits.
Dialing note: 303 is part of an overlay complex with 720, 983, so local calls in this area are dialed with all ten digits.
Numbering details on this page (service dates and overlay status) are checked against the NANPA numbering registry. Registry data as of 07/16/2026.
303 phone number FAQ
- How do I get a 303 phone number?
- New 303 numbers are no longer being issued. Pick an available 720 overlay number for Denver, CO and sign up for AvoCall. It rings exactly like a 303 number and works for calls and texts on your existing phone over WiFi or data. Current web pricing is verified at checkout.
- Where is the 303 area code?
- It serves Denver, CO and nearby cities in Colorado, including Denver, Aurora, Thornton.
- Can I receive verification codes on a 303 number?
- AvoCall 303 numbers support calling and messaging. Verification-text compatibility varies by sender; short-code and 2FA delivery is not guaranteed.