During the January Uprising, a unit of Jozef Wysocki operated in the area of Radyvyliv. After World War I, the town returned to Poland, and was part of Dubno County, Volhynian Voivodeship. Its residents were Jewish (50%), Ukrainian (31%), and Polish (17%). During the Volhynian Genocide, ethnic Poles from villages in the area fled to the town, to escape Ukrainian nationalists. Almost all those who survived the slaughter left Radyvyliv, and settled in the People's Republic of Poland’s Recovered Territories.