Cincinnati, OH is currently using one area code which is area code 513. Area Code 513 was created in 1947 and was one of the original area codes assigned to Ohio.
In addition to Cincinnati, OH area code 513 serves southwestern Ohio including the larger cities and communities of Cincinnati, Fairfield, Hamilton, Mason, Middletown, Norwood, Oxford in addition to many smaller communities.
Cincinnati, OH is located in Hamilton County and observes the Eastern Time Zone. View our Times by Area Code tool.