85 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 01453 | Leominster | 43,635 |
| 01420 | Fitchburg | 41,677 |
| 01604 | Worcester | 39,988 |
| 01545 | Shrewsbury | 38,440 |
| 01605 | Worcester | 31,086 |
| 01757 | Milford | 30,473 |
| 01610 | Worcester | 28,719 |
| 01602 | Worcester | 25,791 |
| 01609 | Worcester | 23,184 |
| 01606 | Worcester | 22,269 |
| 01581 | Westborough | 21,591 |
| 01440 | Gardner | 21,298 |
| 01603 | Worcester | 21,034 |
| 01550 | Southbridge | 17,806 |
| 01570 | Webster | 17,674 |
| 01520 | Holden | 16,864 |
| 01501 | Auburn | 16,780 |
| 01532 | Northborough | 15,694 |
| 01510 | Clinton | 15,430 |
| 01569 | Uxbridge | 14,127 |
| 01527 | Millbury | 13,899 |
| 01331 | Athol | 13,865 |
| 01507 | Charlton | 13,359 |
| 01562 | Spencer | 11,961 |
| 01571 | Dudley | 11,886 |
| 01462 | Lunenburg | 11,822 |
| 01540 | Oxford | 11,521 |
| 01588 | Whitinsville | 10,357 |
| 01475 | Winchendon | 10,194 |
| 01772 | Southborough | 9,781 |
| 01590 | Sutton | 9,287 |
| 01516 | Douglas | 9,287 |
| 01504 | Blackstone | 9,211 |
| 01543 | Rutland | 9,202 |
| 01607 | Worcester | 8,755 |
| 01523 | Lancaster | 8,470 |
| 01473 | Westminster | 8,289 |
| 01564 | Sterling | 8,111 |
| 01568 | Upton | 7,926 |
| 01519 | Grafton | 7,738 |
| 01583 | West Boylston | 7,516 |
| 01536 | North Grafton | 7,119 |
| 01566 | Sturbridge | 7,054 |
| 01430 | Ashburnham | 6,450 |
| 01756 | Mendon | 6,266 |
| 01524 | Leicester | 6,110 |
| 01534 | Northbridge | 6,097 |
| 01747 | Hopedale | 6,024 |
| 01740 | Bolton | 5,698 |
| 01451 | Harvard | 5,359 |
| 01612 | Paxton | 4,996 |
| 01608 | Worcester | 4,951 |
| 01585 | West Brookfield | 4,942 |
| 01560 | South Grafton | 4,914 |
| 01505 | Boylston | 4,896 |
| 01005 | Barre | 4,786 |
| 01535 | North Brookfield | 4,739 |
| 01452 | Hubbardston | 4,339 |
| 01468 | Templeton | 4,157 |
| 01436 | Baldwinville | 3,720 |
| 01541 | Princeton | 3,500 |
| 01506 | Brookfield | 3,442 |
| 01503 | Berlin | 3,311 |
| 01529 | Millville | 3,156 |
| 01522 | Jefferson | 3,021 |
| 01518 | Fiskdale | 2,835 |
| 01083 | Warren | 2,746 |
| 01542 | Rochdale | 2,572 |
| 01611 | Cherry Valley | 2,401 |
| 01515 | East Brookfield | 2,120 |
| 01434 | Devens | 1,889 |
| 01537 | North Oxford | 1,821 |
| 01031 | Gilbertville | 1,715 |
| 01068 | Oakham | 1,623 |
| 01368 | Royalston | 1,497 |
| 01366 | Petersham | 1,173 |
| 01092 | West Warren | 1,123 |
| 01531 | New Braintree | 925 |
| 01074 | South Barre | 749 |
| 01745 | Fayville | 660 |
| 01037 | Hardwick | 486 |
| 01438 | East Templeton | 192 |
| 01094 | Wheelwright | 64 |
| 01561 | South Lancaster | 0 |
| 01525 | Linwood | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 85 ZCTAs in Worcester County, Massachusetts (US Census).