Okeana, originally known as Tariff, is an unincorporated community in central Morgan Township, Butler County, Ohio, United States. It is located on Dry Fork Creek, a tributary of the Great Miami River, on State Route 126 about three miles northwest of Shandon in sections 21 and 26 of R1ET3N of the Congress Lands. It is a mile north of Alert, a mile east of Macedonia, and ten miles southwest of Hamilton. The bulk of addresses served by the Okeana post office are in the Ross Local School District, but parts of the region are in the Southwest Local School District.
A post office was established there in 1828 as Tariff, but the name was changed to Okeana on May 27, 1858, after the daughter of the Indian chief Kiatta, for whom a stream in Morgan Township is named. The town was laid out by the Rev. Benjamin Lloyd.
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