1) Northern Nigeria:
- Comprises: Adamawa, Bauchi, Benue, Borno, Gombe, Jigawa, Kaduna, Kano, Katsina, Kebbi, Kogi, Nasarawa, Niger, Plateau, Sokoto, Taraba, Yobe, Zamfara
- Geographically larger
- Predominantly Muslim
- Hausa-Fulani ethnic group has the largest population
2) Southern Nigeria:
- Comprises: Abia, Akwa Ibom, Anambra, Bayelsa, Cross River, Delta, Ebonyi, Edo, Ekiti, Enugu, Imo, Lagos, Ogun, Ondo, Osun, Oyo, Rivers
- Geographically smaller
- Diverse religious beliefs (Christianity, Islam, Traditional)
- Yoruba and Igbo ethnic groups are predominant
Furthermore, Nigeria is divided into six geopolitical zones:
- North-Central Zone: Benue, Kogi, Kwara, Nasarawa, Niger, Plateau
- North-East Zone: Adamawa, Bauchi, Borno, Gombe, Taraba, Yobe
- North-West Zone: Jigawa, Kaduna, Kano, Katsina, Kebbi, Sokoto, Zamfara
- South-East Zone: Abia, Anambra, Ebonyi, Enugu, Imo
- South-South Zone: Akwa Ibom, Bayelsa, Cross River, Delta, Edo, Rivers
- South-West Zone: Ekiti, Lagos, Ogun, Ondo, Osun, Oyo