Worcester County, Massachusetts Zip Codes
| Leominster | 43,550 |
| Fitchburg | 41,661 |
| Worcester | 40,724 |
| Shrewsbury | 38,734 |
| Worcester | 30,590 |
| Milford | 30,411 |
| Worcester | 27,033 |
| Worcester | 25,869 |
| Worcester | 23,256 |
| Worcester | 22,636 |
| Westborough | 21,360 |
| Gardner | 21,231 |
| Worcester | 20,678 |
| Webster | 17,671 |
| Southbridge | 17,669 |
| Holden | 16,893 |
| Auburn | 16,763 |
| Northborough | 15,647 |
| Clinton | 15,347 |
| Uxbridge | 14,039 |
| Millbury | 13,852 |
| Athol | 13,845 |
| Charlton | 13,338 |
| Spencer | 11,955 |
| Dudley | 11,885 |
| Lunenburg | 11,765 |
| Oxford | 11,420 |
| Whitinsville | 10,468 |
| Winchendon | 10,180 |
| Southborough | 9,867 |
| Sutton | 9,268 |
| Douglas | 9,213 |
| Blackstone | 9,195 |
| Rutland | 9,102 |
| Worcester | 8,630 |
| Lancaster | 8,395 |
| Westminster | 8,220 |
| Sterling | 8,053 |
| Upton | 7,828 |
| Grafton | 7,634 |
| West Boylston | 7,476 |
| North Grafton | 7,282 |
| Sturbridge | 6,795 |
| Ashburnham | 6,457 |
| Mendon | 6,238 |
| Leicester | 6,077 |
| Hopedale | 6,021 |
| Northbridge | 5,893 |
| Bolton | 5,653 |
| Harvard | 5,362 |
| Worcester | 5,080 |
| Paxton | 5,013 |
| Boylston | 4,855 |
| West Brookfield | 4,841 |
| Barre | 4,837 |
| North Brookfield | 4,750 |
| South Grafton | 4,734 |
| Hubbardston | 4,338 |
| Templeton | 4,009 |
| Baldwinville | 3,694 |
| Berlin | 3,514 |
| Princeton | 3,497 |
| Brookfield | 3,443 |
| Millville | 3,176 |
| Fiskdale | 3,047 |
| Jefferson | 2,890 |
| Rochdale | 2,815 |
| Warren | 2,539 |
| Cherry Valley | 2,188 |
| East Brookfield | 2,120 |
| North Oxford | 1,935 |
| Devens | 1,763 |
| Gilbertville | 1,697 |
| Oakham | 1,585 |
| Royalston | 1,455 |
| West Warren | 1,428 |
| Petersham | 1,177 |
| New Braintree | 984 |
| South Barre | 694 |
| Hardwick | 582 |
| Fayville | 554 |
| East Templeton | 385 |
| Wheelwright | 44 |
| Linwood | 31 |
| South Lancaster | 0 |
- Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.