85 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 01453 | Leominster | 43,851 |
| 01420 | Fitchburg | 41,839 |
| 01604 | Worcester | 39,812 |
| 01545 | Shrewsbury | 38,876 |
| 01757 | Milford | 30,609 |
| 01605 | Worcester | 30,579 |
| 01610 | Worcester | 30,444 |
| 01602 | Worcester | 27,092 |
| 01606 | Worcester | 22,844 |
| 01609 | Worcester | 22,047 |
| 01581 | Westborough | 21,944 |
| 01440 | Gardner | 21,276 |
| 01603 | Worcester | 20,868 |
| 01550 | Southbridge | 17,928 |
| 01570 | Webster | 17,748 |
| 01520 | Holden | 16,912 |
| 01501 | Auburn | 16,877 |
| 01532 | Northborough | 15,750 |
| 01510 | Clinton | 15,563 |
| 01569 | Uxbridge | 14,304 |
| 01527 | Millbury | 13,961 |
| 01331 | Athol | 13,922 |
| 01507 | Charlton | 13,435 |
| 01562 | Spencer | 12,008 |
| 01571 | Dudley | 11,929 |
| 01462 | Lunenburg | 11,919 |
| 01540 | Oxford | 10,979 |
| 01475 | Winchendon | 10,265 |
| 01588 | Whitinsville | 10,258 |
| 01772 | Southborough | 9,907 |
| 01590 | Sutton | 9,422 |
| 01516 | Douglas | 9,376 |
| 01543 | Rutland | 9,353 |
| 01504 | Blackstone | 9,255 |
| 01607 | Worcester | 8,706 |
| 01523 | Lancaster | 8,606 |
| 01473 | Westminster | 8,374 |
| 01564 | Sterling | 8,183 |
| 01519 | Grafton | 8,058 |
| 01568 | Upton | 8,011 |
| 01583 | West Boylston | 7,606 |
| 01566 | Sturbridge | 7,362 |
| 01536 | North Grafton | 6,860 |
| 01430 | Ashburnham | 6,481 |
| 01524 | Leicester | 6,327 |
| 01756 | Mendon | 6,325 |
| 01534 | Northbridge | 6,230 |
| 01747 | Hopedale | 6,027 |
| 01740 | Bolton | 5,737 |
| 01451 | Harvard | 5,487 |
| 01005 | Barre | 5,204 |
| 01612 | Paxton | 5,002 |
| 01560 | South Grafton | 4,984 |
| 01505 | Boylston | 4,948 |
| 01608 | Worcester | 4,932 |
| 01585 | West Brookfield | 4,810 |
| 01535 | North Brookfield | 4,760 |
| 01452 | Hubbardston | 4,371 |
| 01468 | Templeton | 4,183 |
| 01436 | Baldwinville | 3,720 |
| 01541 | Princeton | 3,529 |
| 01506 | Brookfield | 3,460 |
| 01503 | Berlin | 3,378 |
| 01529 | Millville | 3,160 |
| 01522 | Jefferson | 3,152 |
| 01083 | Warren | 2,858 |
| 01542 | Rochdale | 2,615 |
| 01518 | Fiskdale | 2,598 |
| 01611 | Cherry Valley | 2,299 |
| 01537 | North Oxford | 2,278 |
| 01515 | East Brookfield | 2,166 |
| 01031 | Gilbertville | 1,676 |
| 01068 | Oakham | 1,639 |
| 01434 | Devens | 1,564 |
| 01368 | Royalston | 1,455 |
| 01092 | West Warren | 1,200 |
| 01366 | Petersham | 1,185 |
| 01531 | New Braintree | 973 |
| 01745 | Fayville | 586 |
| 01037 | Hardwick | 572 |
| 01074 | South Barre | 368 |
| 01438 | East Templeton | 330 |
| 01094 | Wheelwright | 52 |
| 01561 | South Lancaster | 0 |
| 01525 | Linwood | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 85 ZCTAs in Worcester County, Massachusetts (US Census).