Area code 513, Telephone prefix in Cincinnati, Ohio, US
The 513 prefix covers southwestern Ohio, connecting Cincinnati and nearby towns such as Forest Park, Hamilton, Lebanon, West Chester, Mason, Maineville and Middletown. It spans across Hamilton, Butler, Clermont, Warren, Brown and Preble counties.
AT&T introduced this code in 1947 as part of the first national numbering plan, originally covering both Cincinnati and Dayton. The territory was later divided, leaving the prefix exclusively assigned to the Cincinnati region.
Cincinnati's telecommunications infrastructure through area code 513 connects diverse communities across Hamilton, Butler, Clermont, Warren, Brown, and Preble counties.
Ten-digit dialing became mandatory across the region in October 2021, so callers should always enter the prefix along with the number. Starting in 2023, the new 283 prefix was added as an overlay to meet growing demand for telephone numbers in the Cincinnati metropolitan area.
The launch of the national 988 crisis hotline in 2021 required switching to ten-digit dialing so emergency services could function smoothly across the region. This change affected every household and business within the prefix coverage area.
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