Chornomorsk, formerly Illichivsk, is a city in Odesa Raion, Odesa Oblast, south-western Ukraine, dependent on the Port of Chornomorsk. It hosts the administration of Chornomorsk urban hromada, one of the hromadas of Ukraine. The city is located around the Sukhyi Estuary. Its population was given as 57,983.

Odesa Raion is a raion (district) of Odesa Oblast, Ukraine. It was created on 17 July 2020 as part of the reform of administrative divisions of Ukraine. Biliaivka Raion, Biliaivka and Illichivsk municipalities, parts of Lyman and Ovidiopol raions, as well as the cities of Odesa, Teplodar, and Yuzhne were merged into Odesa Raion. The center of the raion is the city of Odesa. Population: 1,378,490.