Chronology
| Regions | States | ||||
|---|---|---|---|---|---|
| 1960 | 1967 | 1976 | 1987 | 1991 | 1996 |
| Eastern | Cross-River | Akwa Ibom | |||
| Cross-River | |||||
| East Central | Imo | Abia | |||
| Imo | |||||
| Anambra | Anambra | ||||
| Enugu | Enugu | ||||
| Ebonyi (also includes part of old Abia) | |||||
| Rivers | Bayelsa | ||||
| Rivers | |||||
| Mid-Western (1963) | Mid-Western | Bendel | Delta | ||
| Edo | |||||
| Western | Lagos | ||||
| Western | Ogun | ||||
| Ondo | Ekiti | ||||
| Ondo | |||||
| Oyo | Osun | ||||
| Oyo | |||||
| Northern | Benue-Plateau | Benue | |||
| Plateau | Nasarawa | ||||
| Plateau | |||||
| Kano | Jigawa | ||||
| Kano | |||||
| Kwara | Kwara | ||||
| Kogi (also includes part of old Benue) | |||||
| North Central | Kaduna | Kaduna | |||
| Katsina | |||||
| North Western | Niger | ||||
| Sokoto | Kebbi | ||||
| Sokoto | Sokoto | ||||
| Zamfara | |||||
| North Eastern | Bauchi | Bauchi | |||
| Gombe | |||||
| Borno | Borno | ||||
| Yobe | |||||
| Gongola | Adamawa | ||||
| Taraba | |||||
Read more about this topic: States Of Nigeria