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. Originally, the city was established as a satellite town of Odesa.