| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 225,680 | 183,802 | 420,841 | |
| 2020 | D | 248,773 | 171,683 | 434,921 | |
| 2016 | D | 198,778 | 157,682 | 396,096 | |
| 2012 | D | 198,244 | 163,390 | 369,112 | |
| 2008 | D | 202,107 | 152,101 | 363,594 | |
| 2004 | D | 192,142 | 144,094 | 340,636 | |
| 2000 | D | 173,769 | 114,139 | 310,148 | |
| 1996 | D | 169,892 | 87,021 | 291,617 | |
| 1992 | D | 138,122 | 101,984 | 315,782 | |
| 1988 | R | 141,485 | 148,365 | 293,256 | |
| 1984 | R | 119,498 | 156,060 | 276,440 | |
| 1980 | R | 117,326 | 120,100 | 278,561 | |
| 1976 | D | 172,320 | 105,217 | 285,245 | |
| 1972 | D | 144,139 | 127,560 | 273,127 | |
| 1968 | D | 168,437 | 88,354 | 265,179 | |
| 1964 | D | 209,383 | 61,388 | 271,631 | |
| 1960 | D | 173,103 | 112,730 | 286,333 | |
| 1956 | R | 107,889 | 163,401 | 271,870 | |
| 1952 | R | 128,898 | 146,094 | 275,637 | |
| 1948 | D | 133,823 | 106,757 | 244,757 | |
| 1944 | D | 123,440 | 98,414 | 222,258 | |
| 1940 | D | 132,541 | 100,468 | 234,108 | |
| 1936 | D | 114,136 | 85,316 | 210,764 | |
| 1932 | R | 87,586 | 88,535 | 180,402 | |
| 1928 | R | 85,675 | 94,290 | 181,010 | |
| 1924 | R | 31,171 | 89,679 | 133,576 | |
| 1920 | R | 34,667 | 81,241 | 118,372 | |
| 1916 | R | 27,540 | 32,541 | 61,680 | |
| 1912 | R | 17,565 | 24,719 | 58,776 | |
| 1908 | R | 16,803 | 34,394 | 55,425 | |
| 1904 | R | 17,037 | 34,124 | 53,461 | |
| 1900 | R | 17,148 | 32,412 | 51,582 | |
| 1896 | R | 10,855 | 35,579 | 48,493 | |
| 1892 | R | 20,797 | 27,130 | 49,471 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Worcester County consistently posts Democratic margins well below the statewide average, reflecting its mix of mid-sized industrial cities, rural towns, and a large college-student population that together make it one of Massachusetts's more competitive counties.
The Democratic margin in Worcester County reached its widest at fifty-four points in 1964. The margin in 2024 was ten points — still decisive.
Worcester County's loyalty is rooted in its place. Median household income of $95,939, a 73% non-Hispanic-white share, and a population of 867,788 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Essex County and Lower Connecticut River Valley Planning Region.
