| Locality | Post Code |
|---|---|
| Agawam, Hampden | 01001 |
| Blandford, Hampden | 01008 |
| Bondsville, Hampden | 01009 |
| Brightwood, Hampden | 01107 |
| Brimfield, Hampden | 01010 |
| Chester, Hampden | 01011 |
| Chicopee, Hampden | 01013, 01020, 01022 |
| East Brimfield, Hampden | 01010 |
| East Longmeadow, Hampden | 01028 |
| Feeding Hills, Hampden | 01030 |
| Fiskdale, Hampden | 01521 |
| Granville, Hampden | 01034 |
| Halland, Hampden | 01521 |
| Halyoke, Hampden | 01041 |
| Hampden, Hampden | 01036 |
| Hampton, Hampden | 01036 |
| Holland, Hampden | 01521 |
| Holyoke, Hampden | 01040, 01041 |
| Indian Orchard, Hampden | 01151 |
| Longmeadow, Hampden | 01106 |
| Ludlow, Hampden | 01056 |
| Monson, Hampden | 01057 |
| Montgomery, Hampden | 01085 |
| Palmer, Hampden | 01069 |
| Russell, Hampden | 01071 |
| Southwick, Hampden | 01077 |