Area Code 513
Ohio
Area code 513 serves Ohio, primarily Cincinnati, in the Eastern Time (ET) time zone. It has served the region since 01-Jan-1947.
Published: Verified against NANPA and FCC records
Overlay Area Code
This area code shares its geographic footprint with an overlay code, so the same cities are served by two area codes. Because overlays leave existing numbers untouched, this region's relief planning favors adding codes over redrawing boundaries.
The codes serving this same region: area code 283 (Cincinnati).
With prefix utilization already at 98.0%, numbering resources here are under sustained pressure — context that explains why overlays were introduced.
In service since: 01-Jan-1947
Area Code Splits
One area code has been carved out of this code's original territory through a geographic split. Each split was a relief action: as demand grew, part of the region was reassigned to a new code rather than overlaying the whole territory.
Split into: area code 937 (Dayton).
Demographics & Economics
Demographic Data Unavailable for Area Code 513
County-level demographic data is not available for this area code because NPA boundary polygons are not publicly distributed by NANPA. We use geographic boundary data from the Colorado Open Data Portal to map area codes to counties, which currently covers 194 of 376 geographic area codes.
Demographic statistics (population, income, education, poverty) require county-level aggregations from Census ACS data. Without a county mapping, these aggregations cannot be computed. We are actively seeking additional data sources to improve coverage.
Statistics are population-weighted aggregations from Census ACS 5-year estimates where county boundary data is available.See Sources for details.
Time Zone
- Eastern Time (ET)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
OH
Major Cities
- Cincinnati
- Hamilton
- Middletown
- Fairfield
- Mason
- Oxford
- Lebanon
- Forest Park
- Norwood
- White Oak
- Monroe
- Sharonville
- Bridgetown
- Harrison
- Blue Ash
- Trenton
- Loveland
- Amelia
- Monfort Heights
- Dent
- Finneytown
- Mack
- Forestville
- Springdale
and 120 more cities
Demographics
Detailed demographic and economic data is not yet available for area code 513.
History
Area code 513 is one of the original area codes established in 1947 when the North American Numbering Plan (NANP) was created. It shares its territory with area code area code 283.
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 513).
| County | Population | Share |
|---|---|---|
| Hamilton, OH | 1,038,746 | 46.8% |
| Butler, OH | 420,932 | 19.0% |
| Warren, OH | 369,721 | 16.7% |
| Clermont, OH | 277,203 | 12.5% |
| Preble, OH | 28,883 | 1.3% |
| Montgomery, OH | 28,217 | 1.3% |
| Brown, OH | 27,110 | 1.2% |
| Clinton, OH | 11,606 | 0.5% |
| Greene, OH | 11,606 | 0.5% |
| Highland, OH | 3,789 | 0.2% |
Area Code 513 Family Tree
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All Descendants
Area code 513 was originally assigned in 01-Jan-1947 to serve OH. Over the years, it has generated 3 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.
Call Context
This area code covers a geographic region across OH, including Cincinnati and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 513.
Other Area Codes in Ohio
Area codes that also serve Ohio, linked for easy comparison.