423,000 (Johnstone and Mandryk 2001).
Delta State, Isoko and Ndokwa LGAs.
Aviara, Elu, Emede, Enhwe, Ibiede, Imiv, Irri (Iri), Itebiege, Iwire (Igbide), Iyede, Iyede-Ami, Iyowo, Ofagbe, Ole (Oleh), Olomoro, Owe (Owhe), Oyede, Ozoro, Ume, Unogboko, Uti, Uzere.
“Sobo” and “Igabo” are offensive names. “Biotu”, interior people, is the Izon name for the Isoko and is not meant offensively by the Izon; however, the Isoko do not like it.