| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Westminster, Worcester | 01473 |
| Postal/ZIP Codes in Wheelwright, Worcester | 01094 |
| Postal/ZIP Codes in Whitinsville, Worcester | 01588 |
| Postal/ZIP Codes in Wilkinsonville, Worcester | 01590 |
| Postal/ZIP Codes in Winchendon, Worcester | 01475 |
| Postal/ZIP Codes in Worcester, Worcester | 01602, 01603, 01604, 01605, 01606, … |