It is bordered to the west by Onicha-Ugbo, to the North by Idumuje-Ugboko and Ewohinmi in Edo State, to the East by Onicha-Uku and Ugbodu and to the south by Issele-Uku.

The suffix "Unor" (meaning - home) is an inclusion to the town's name so as to differentiate it from the breakaway community Idumuje -Ugboko; by a man called Nwoko and his supporters some 300 years ago.

Ime-Ogbe is the nucleus of Idumuje- Unor,which can be traced to Ihu-ani Ihummor on Iloh Ukwu (First Major Road) by a man named Ikeke, who was said to have migrated from Idumu-ogie in the present day Bini Kingdom of Edo State.

Then followed by other migrants, who made up the traditional six villages listed as follows: Okwunye, Idumu-obu, Ogbe-akwu, Atuma and Aniofu [1] According to a frontline Nigerian journalist from Idumuje Unor, Norbert kpomiose Chiazor " One of the monarchs of Idumuje-Unor, Agbogidi Obi James Anyasi II was the longest reigning king in Africa and the second in the world after King Bhumibol Adelyadej of Thailand reputed as the World's longest reigning monarch.

The community is made up of peoples originally from various clans such as, Benin, the Esan, Asaba and some Yoruba ethnicities centuries ago.