Below is the list of all postal/zip codes of all states in Nigeria.

Abia – 440001
Adamawa – 640001
Anambra – 420001
Akwa Ibom – 520001
Bauchi – 740001
Bayelsa – 560001
Benue – 970001
Borno – 600001
Cross River – 540003
Delta – 320001
Ebonyi – 840001
Enugu – 400001
Edo – 300001
Ekiti – 360001
Gombe – 760001
Imo – 460001
Jigawa – 720001
Kaduna – 800001
Kano – 700001
Katsina – 820001
Kebbi – 860001
Kogi – 260001
Kwara – 240001
Lagos (Island) – 101001
Lagos (Mainland) – 100001
Nasarawa – 950001
Niger – 920001
Ogun – 110001
Ondo – 340001
Osun – 230001
Oyo – 200001
Plateau – 930001
Rivers – 500001
Sokoto – 840001
Taraba – 660001
Yobe – 320001
Zamfara – 880001

Source: http://nigeriapostalzipcodes.com.ng/postal-codes-nigeria-states/

cc: lalasticlala