| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Manley | WA6 |
| Postal/ZIP Codes in Manley Common | WA6 |
| Postal/ZIP Codes in Marbury | CW9 6AR, CW9 6AS |
| Postal/ZIP Codes in Marlston-Cum-Lache | CH4 |
| Postal/ZIP Codes in Marston | CW9 |
| Postal/ZIP Codes in Marton | CW7 |
| Postal/ZIP Codes in Meadowbank | CW7 2PG, CW7 2PH, CW7 … |
| Postal/ZIP Codes in Mickle Trafford | CH2 |
| Postal/ZIP Codes in Milton Green | CH3 |
| Postal/ZIP Codes in Mollington | CH1 |
| Postal/ZIP Codes in Moston | CH2 |
| Postal/ZIP Codes in Mouldsworth | CH3 |
| Postal/ZIP Codes in Moulton | CW9 |
| Postal/ZIP Codes in Ness | CH64 |
| Postal/ZIP Codes in Neston | CH64 |
| Postal/ZIP Codes in Newton | CH2, WA6 |
| Postal/ZIP Codes in Newton-by-Tattenhall | CH3 |
| Postal/ZIP Codes in Nomans Heath | SY14 |
| Postal/ZIP Codes in Norcott Brook | WA4 4DX, WA4 4DY, WA4 … |
| Postal/ZIP Codes in Norley | WA6 |
| Postal/ZIP Codes in Northwich | CW8, CW9 |
| Postal/ZIP Codes in Oakmere | CW8 |
| Postal/ZIP Codes in Oathills | SY14 |
| Postal/ZIP Codes in Occleston | CW10 |
| Postal/ZIP Codes in Oldcastle | SY14 |
| Postal/ZIP Codes in Oscroft | CH3 |