Area codes 513 and 283

Area codes 513 and 283 are telephone area codes in the North American Numbering Plan (NANP) for the southwest of the U.S. state of Ohio, including Cincinnati and surrounding cities, such as Forest Park, Hamilton, Lebanon, West Chester, Mason, Maineville, Middletown, Milford, Norwood, Oxford, Harrison, Cleves, Miamitown and Trenton.

AT&T assigned area code 513 to the southwestern quadrant, which included Cincinnati and Dayton.

The eastern and northern portions, including Dayton, received area code 937.

[1] This made 513 largely coextensive with the Cincinnati metropolitan area, though a few outer eastern suburbs transferred to 937.

[9][10] As of April 2023[update], the two area codes combined are projected to avoid exhaustion for the foreseeable future.