| Locality | Post Code |
|---|---|
| Acton, Middlesex | 01718, 01720 |
| Arlington, Middlesex | 02474, 02476 |
| Arlington Heights, Middlesex | 02475 |
| Ashby, Middlesex | 01431 |
| Ashland, Middlesex | 01721 |
| Auburndale, Middlesex | 02466 |
| Ayer, Middlesex | 01432 |
| Bedford, Middlesex | 01730 |
| Belmont, Middlesex | 02478 |
| Billerica, Middlesex | 01821 |
| Boxborough, Middlesex | 01719 |
| Burlington, Middlesex | 01803 |
| Cambridge, Middlesex | 02138, 02139, 02140, 02141, 02142 |
| Cambridgeport, Middlesex | 02139 |
| Carlisle, Middlesex | 01741 |
| Chelmsford, Middlesex | 01824 |
| Cherry Brook, Middlesex | 02493 |
| Chestnut Hill, Middlesex | 02467 |
| Cochituate, Middlesex | 01778 |
| Concord, Middlesex | 01742 |
| Dracut, Middlesex | 01826 |
| Dunstable, Middlesex | 01827 |
| East Arlington, Middlesex | 02474 |
| East Cambridge, Middlesex | 02141 |
| East Pepperell, Middlesex | 01463 |
| East Somerville, Middlesex | 02143 |