The history of present-day Imo State is rooted in the wider history of the Igbo people of southeastern Nigeria. Before colonial rule, the area consisted of numerous autonomous communities organised around villages, kindreds, family compounds, councils of elders, age grades, title societies and traditional institutions. Unlike centralised kingdoms found in some other parts of Nigeria, many Igbo communities operated through decentralised political systems in which authority was shared among different social institutions.
Important historic communities in present-day Imo include Owerri, Orlu, Okigwe, Oguta, Ohaji, Egbema, Mbaitoli, Ikeduru, Mbaise, Ehime Mbano, Isiala Mbano, Ideato, Nkwerre and Nwangele. These communities developed distinctive customs while sharing the broader Igbo language, social structures, religious traditions and agricultural economy.
Traditional religious life involved belief in Chukwu, numerous local deities and spirits, ancestors and sacred natural sites. Community festivals, masquerades, title-taking ceremonies, age-grade activities and yam celebrations formed important parts of social life.
Agriculture was central to pre-colonial economic life. Yam, cassava, cocoyam, plantain, vegetables and palm produce were important crops. Palm oil and kernels became increasingly important commodities as regional and later international trade expanded.