According to E. J Alagoa, the Ijaw tribe is made of 43 clans:
a. Western Delta Fringe
1. Apoi
2. Arogbo
3. Furupagha
4. Olodiama
5. Gbaramatu
6. Ogbo
b. Western Delta
1. Obotebe
2. Mein
3. Seimibiri
4. Tuomo
5. Takakiri
6. Kabowei
7. Kumbowei
8. Operemo
9. Oyakiri
10. Ogulagha
11. Iduwini
c. Central Delta
1. Apoi
2. Basan
3. Olodiama
4. Oporoma
5. Ogboin
6. Tungbo
7. Kolokuma
8. Opokuma
9. Gbaran
10. Zarama
11. Okodia
12. Biseni
13. Ekpetiama
14. Tarakiri
15. Boma
16. Akasa
d. Eastern Delta
1. Nembe
2. Kalabari
3. Okrika
4. Ibani
e. Eastern Delta Fringe
1. Nkoro
2. Opobo
f. Northern Delta Fringe
1. Epie-Atissa
2. Ogbia
3. Oruma
