Area Code Atlas

Area code 513 assigned to southwestern Ohio

In 1947, as part of the first nationwide telephone numbering plan, area code 513 was assigned to the southwestern quadrant of Ohio, including Cincinnati and Dayton.

Area code 513 split to create 937

In 1996, area code 513 was split to create area code 937. The split assigned the eastern and northern portions, including Dayton, to 937, providing more central office prefixes and telephone numbers, and leaving 513 largely coextensive with the Cincinnati metropolitan area.

NANP-Split of 513 (Ohio) Numbering Plan Area (NPA)

NPA 937 split from 513

On September 28, 1996, area code 937 was created in a split from area code 513. The new code served Dayton, Springfield, and much of southwestern Ohio, relieving number exhaustion in the region.

NPA 283 reserved as overlay for 513

Area code 283 was reserved in 2000 as an overlay code for the 513 numbering plan area, anticipating future number exhaustion. Implementation was delayed due to a slowdown in demand.

Overlay of area code 513 with 283 planned

In 2000, area code 283 was reserved as an overlay for 513, but implementation was suspended due to economic downturn and number return issues.

Permissive 10-digit dialing for 513/283 overlay begins

Permissive 10-digit dialing for the planned 513/283 overlay began on January 15, 2001, allowing callers to use either 7 or 10 digits. The implementation was later suspended due to reduced demand for new numbers.

NPA 283 overlay on 513 announced

New NPA 283 to Overlay NPA 513 (Ohio)

NPA 513 Boundary Realignment Franklin Rate Center (Ohio)

Suspension of 513/283 NPA Overlay (Ohio)

Overlay relief approved for 513 with new area code 283

On December 15, 2021, the Public Utilities Commission of Ohio approved an all-service overlay complex for the 513 area code, introducing area code 283 to address projected number exhaustion by late 2023.

NPA 283 overlay on 513 announced

NPA 283 to Overlay NPA 513 (Ohio)

Area code 283 overlay activated on 513

On April 28, 2023, area code 283 officially became available as an overlay for the 513 area code in Cincinnati, Ohio, addressing number exhaustion after the depletion of remaining number blocks in 513.