North American Numbers Source-cited · ownership disclosed
Area code
513
In service
United States · since 1947

Cincinnati

One of Ohio's four original 1947 area codes, now covering the Cincinnati metro and southwestern Ohio after Dayton split off in 1996.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Cincinnati
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2073 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 513 is

Southwestern Ohio (Cincinnati metropolitan area).

Communities served wholly or partly by 513:

CincinnatiHamiltonMiddletownMasonWest ChesterNorwoodOxford

Representative; also Forest Park, Lebanon, Milford, Harrison, Trenton and others.

B · Relationships

How it relates to other codes

The codes 513 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Spawned · 1996 937 Dayton/Springfield Dayton and eastern/northern areas split off as 937.
Overlay · 2023 283 Cincinnati (overlay) 283 overlays the 513 area.
What's changing. Overlaid by 283 since April 28, 2023; ten-digit dialing required.
C · History

How 513 got here

1947
Established as an original NANP area code for the southwestern quadrant (included Cincinnati and Dayton).
Source: Wikipedia: Area codes 513 and 283
1996
Dayton area split off as 937, leaving 513 largely coextensive with metro Cincinnati.
Source: Wikipedia: Area codes 513 and 283
2023-04-28
Overlaid by area code 283.
Source: Wikipedia: Area codes 513 and 283
D · Capacity

How full it is

Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
3,366

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 513 with another code →
Sources
Wikipedia ↗
Area codes 513 and 283
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.