The 983 area code covers the same area as 303, including Denver, Longmont and 9 more places in Colorado.
Area code 983 is in Colorado, on Mountain Time. In the 983 area, phone numbers are given out most in Denver County, then Boulder and Weld counties. It has been in service since June 17, 2022. 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
- June 17, 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, the city and state on the listing, and whether it is a mobile, landline or VoIP line. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup.
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.
Each prefix, or block of 1,000 numbers inside it, is also handed to a carrier. A number keeps its digits when its owner switches carrier, so the prefix no longer tells you who carries it today. Our free carrier lookup shows which carrier a 983 number is on now.
983 started in 2022 as an overlay on 303, and its ground has not changed since.
2022
983 starts on June 17, 2022, 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.
The area codes closest to 983 are 970, 719 and 308.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
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 the 983 area, phone numbers are given out most in Denver County, then Boulder and Weld counties.
What state is area code 983 in?
Colorado. 983 is a Colorado area code on Mountain Time.
What cities use area code 983?
The places holding the most 983 prefixes are Denver, Longmont, Fort Lupton, Keenesburg, Hudson, Georgetown, Deer Trail and Strasburg, out of 11 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
What time zone is area code 983 in?
983 is on Mountain Time.
When did area code 983 start?
983 went into service on June 17, 2022, as an overlay on 303: new numbers for the same area.
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.
Is 983 a toll-free number?
No. 983 is a regular area code for Denver and Longmont in Colorado, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 983?
The closest are 970/748 (Fort Collins, Colorado), 719 (Colorado Springs, Colorado) and 308 (Grand Island, Nebraska), measured between the centres of each area.
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.