| Kaduna (stad) | Kaduna (staat) | Nigeria | 1,582,102 | 800211, 800212, 800213, 800214, 800221, 800241, 800242, 800243, 800244, 800245, 800246, 800247, 800251, 800252, 800261, 800262, 800263, 800264, 800265, 800266, 800271, 800272, 800273, 800281, 800282, 800283 |
| Kano (stad) | Kano (staat) | Nigeria | 3,626,068 | 671101, 700105, 700213, 700222, 700281 |
| Katsina (stad) | Katsina (staat) | Nigeria | 432,149 | 820101, 820211, 820212, 820213, 820221, 820231, 820241, 820251, 820252, 820261, 820281 |
| Matazu | Katsina (staat) | Nigeria | — | 833102 |
| Zaria | Kaduna (staat) | Nigeria | 975,153 | 810211, 810212, 810221, 810222, 810223, 810224, 810225, 810231, 810232, 810241, 810251, 810253, 810254, 810281, 810282 |