Leuconia or Leukonia () was a town of ancient Ionia, about the possession of which the Chians were involved in a war with Erythrae.Polyaenus 8.66. It was, according to Plutarch, was a colony of Chios.Plutarch de Virt. Mul. vii. p. 7, ed. Reiske.
Its site is unlocated.
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