The 283 area code covers the same area as 513, including Cincinnati, Hamilton and 17 more places in Ohio.
Area code 283 is in Ohio, on Eastern Time. In the 283 area, phone numbers are given out most in Hamilton County, then Butler and Warren counties. It has been in service since April 28, 2023. 513 covers the same area, so two neighbours can have different area codes.
- Where
- 5 counties in Ohio, mostly Hamilton County, Butler County and Warren County
- Time zone
- Eastern Time
- In service since
- April 28, 2023
- Shares its area with
- 513 (since 1947)
- Prefixes in use
- 48
- How to dial
- Local calls need all 10 digits: 283-555-0142.
Find out who called you from a 283 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. 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. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (283) number is on today, use our free carrier lookup.
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Cincinnati holds 29% of the phone prefixes in area code 283.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 48 prefixes in use shows where 283 numbers are actually given out.
- Cincinnati14 prefixes, 29%
- Hamilton6 prefixes, 13%
- Trenton2 prefixes, 4%
- Mason2 prefixes, 4%
- Lebanon2 prefixes, 4%
- Middletown2 prefixes, 4%
- Morrow1 prefix, 2%
- South Lebanon1 prefix, 2%
Also served: Newtonsville, Bethel, Williamsburg and Monroe and 7 smaller places.
Of the carriers named here, AT&T Mobility holds the most phone number prefixes in area code 283: 9 of 48.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 48 prefixes in use in 283 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| AT&T MobilityMobile network | 9 | 19% |
| Wide Voice | 5 | 10% |
| T-MobileMobile network | 4 | 8% |
| Five9 | 2 | 4% |
| Boost MobileMobile phone service | 1 | 2% |
| Callworks | 1 | 2% |
| 7 other carriers | 26 | 54% |
100% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
283 started in 2023 as an overlay on 513, and its ground has not changed since.
2023
283 starts on April 28, 2023, as an overlay on 513: new numbers on the same ground.
A 283 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 283 are 937, 859 and 614.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 283.
Where is area code 283?
283 covers Cincinnati, Hamilton, Middletown and Mason and 15 more places in Ohio. In the 283 area, phone numbers are given out most in Hamilton County, then Butler and Warren counties.
What state is area code 283 in?
Ohio. 283 is an Ohio area code on Eastern Time.
What cities use area code 283?
The places holding the most 283 prefixes are Cincinnati, Hamilton, Middletown, Mason, Lebanon, Oxford, Harrison and Seven Mile, out of 19 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 283?
No single phone company owns 283. NANPA's records list its 48 prefixes across many carriers, and the ones named on this page include AT&T Mobility, Wide Voice and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 283 in?
283 is on Eastern Time.
When did area code 283 start?
283 went into service on April 28, 2023, as an overlay on 513: new numbers for the same area.
Is 283 the same area as 513?
Yes. 513 (since 1947) covers the same ground as 283. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 283 number?
Local calls need all 10 digits: 283-555-0142.
Is 283 a toll-free number?
No. 283 is a regular area code for Cincinnati and Hamilton in Ohio, 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 283?
The closest are 937/326 (Dayton, Ohio), 859 (Lexington, Kentucky), 614/380 (Columbus, Ohio) and 502 (Louisville, Kentucky), measured between the centres of each area.
Who called me from a 283 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 283 a scam?
283 is a real Ohio 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.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.