Isin Local Government Area in Kwara State uses postal codes ranging from 251105 to 251106.
Here are the postal codes for the towns and districts in Isin:
Isin
| Location | Postcode |
| Abata Oke | 251105 |
| Adigun | 251105 |
| Ajegunle | 251105 |
| Alla | 251105 |
| Budo Manasara | 251105 |
| Budo-Igbira | 251105 |
| Edidi | 251105 |
| Eleyin | 251105 |
| Igbesi | 251105 |
| Ijara-Isin | 251105 |
| Iji | 251105 |
| Iklo | 251105 |
| Isanlu Isin | 251105 |
| Iwo | 251105 |
| Kajola | 251105 |
| Kudu-Owode | 251105 |
| Oba | 251105 |
| Odo-Eku | 251105 |
| Odo-Ore | 251105 |
| Oke-Aba | 251105 |
| Oke-Onigibin | 251105 |
| Oke-Oyi | 251105 |
| Opanda | 251105 |
| Opega | 251105 |
| Owa Onire | 251105 |
| Owu Isin | 251105 |
| Pamo | 251105 |
| Sabaja | 251105 |
Oko-Ola
| Location | Postcode |
| nisan | 251106 |
| Oko | 251106 |
| Olla | 251106 |