Here is the list of Nigeria postal code for all its states and FCT:
Abia – 440001
Adamawa – 640001
Akwa Ibom – 520001
Anambra – 420001
Bauchi – 740001
Bayelsa – 561001
Benue – 970001
Borno – 600001
Cross River – 540001
Delta – 320001
Ebonyi – 840001
Edo – 300001
Ekiti – 360001
Enugu - 400001
Gombe – 760001
Imo – 460001
Jigawa – 720001
Kaduna – 700001
Kano – 800001
Katsina – 820001
Kebbi – 860001
Kogi – 260001
Kwara – 240001
Lagos (mainland/island) – 100001/101001
Nasarawa – 962001
Niger – 920001
Ogun – 110001
Ondo – 340001
Osun – 230001
Oyo – 200001
Plateau – 930001
Rivers – 500001
Sokoto – 840001
Taraba – 660001
Yobe – 320001
Zamfara – 860001
Federal Capital Territory (FCT) is 900001
See Also Full Nigeria Zip Codes: https://blog.areagig.com/2020/11/full-nigeria-zip-codes.html