Area code 513 serves southwestern Ohio, including Cincinnati and surrounding suburbs such as Hamilton and Middletown. As one of the original area codes from 1947, it remains a central piece of Ohio’s telecommunications and cultural identity. Cincinnati is a major city with a deep history in commerce, architecture, and sports. The region is also known for its strong German-American roots and riverfront culture. Ten-digit dialing became mandatory after the introduction of the 283 overlay in 2023. Area code 513 is a long-standing emblem of Cincinnati pride and legacy, used in business, politics, and pop culture alike.