The municipal unit consists of the communities Akritochori, Charakopio, Chrysokellaria, Falanthi, Kaplani, Kompoi, Koroni, Vasilitsi, Vounaria and Iamia.

[8][9] It was not until 1206 or 1207, that a Venetian fleet under Premarini and the son of Doge Enrico Dandolo took the Messenian peninsula and Koroni with its neighbouring Methoni from Champlitte's men.

[21] In the mid-14th century, the two Venetian colonies suffered greatly from the Black Death, so that it was necessary to send a fresh batch of colonists from home, and the franchise was extended to all the inhabitants, except the Jews.

[14] Supported by the local population, the town was retaken by admiral Andrea Doria in 1532, but in the spring of 1533 the Ottomans laid siege to it.

Doria was able to relieve the town, prompting Sultan Suleyman the Magnificent to call upon the services of the corsair captain Hayreddin Barbarossa.

[14] Albanian inhabitants who participated in the revolt travelled with Doria and populated several settlements in the Kingdom of Naples, including San Chirico Nuovo, Ginestra and Maschito, where the Arbëreshë dialect is still spoken.

[14] In 1582, the fortress was part of the Sanjak of Mezistre, and reportedly contained 300 Christian and 10 Jewish households, while the Muslim population was limited to the officials and a 300-strong garrison, which apparently remained constant over the entire Ottoman period.

[26] In the Morean War, Koroni was the first place the Venetians targeted during their conquest of the Peloponnese, capturing it after a siege (25 June – 7 August 1685).

[14] It remained in Venetian hands as part of the "Kingdom of the Morea" until the entire peninsula was recaptured by the Ottomans in 1715, during the Seventh Ottoman–Venetian War.

By 1805, the English traveller William Martin Leake reported that trade had stopped, that the port offered only "insecure anchorage", and that the Janissary garrison abused the local population.

[14] Koroni became part of the modern Greek state in 1828, when it was liberated by the French General Nicolas Joseph Maison.

[27] Koroni has a hot-summer mediterranean climate (Köppen Csa) with mild, rainy winters and hot, dry summers.