The 983 area code covers the same area as 303, including Denver, Longmont and 9 more places in Colorado.
983 has been in service since 2022, on Mountain Time. 303 and 720 cover the same area, so two neighbours can have different area codes.
- Where
- 6 counties in Colorado, mostly Denver County, Boulder County and Weld County
- Time zone
- Mountain Time
- In service since
- 2022
- Shares its area with
- 303 (since 1947) and 720 (since 1998)
- Prefixes in use
- 46
- How to dial
- Local calls need all 10 digits: 983-555-0142.
Find out who called you from a 983 number.
Enter the full 10-digit number to see who it is listed to, where it is registered, and whether it is a mobile, landline or VoIP line.
Denver holds 70% of the phone prefixes in area code 983.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 46 prefixes in use shows where 983 numbers are actually given out.
- Denver32 prefixes, 70%
- Longmont7 prefixes, 15%
- Fort Lupton3 prefixes, 7%
- Strasburg2 prefixes, 4%
- Roggen1 prefix, 2%
Also served: Bennett, Byers and Roggen.
983 started in 2022 as an overlay on 303, and its ground has not changed since.
2022
983 starts as an overlay on 303: new numbers on the same ground.
A 983 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
Colorado has 5 other area codes.
These are the questions people ask most about area code 983.
Where is area code 983?
983 covers Denver, Longmont, Fort Lupton and Keenesburg and 7 more places in Colorado, in Denver County, Boulder County and Weld County.
What time zone is area code 983 in?
983 is on Mountain Time.
Is 983 the same area as 303 and 720?
Yes. 303 (since 1947) and 720 (since 1998) cover the same ground as 983. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 983 number?
Local calls need all 10 digits: 983-555-0142.
Who called me from a 983 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 983 a scam?
983 is a real Colorado area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.