| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 287,434 | 167,795 | 457,838 | |
| 2020 | D | 312,437 | 144,731 | 462,364 | |
| 2016 | D | 272,926 | 131,238 | 420,655 | |
| 2012 | D | 240,785 | 143,122 | 388,447 | |
| 2008 | D | 261,810 | 147,824 | 413,044 | |
| 2004 | D | 229,849 | 159,628 | 395,770 | |
| 2000 | D | 218,010 | 139,278 | 371,813 | |
| 1996 | D | 196,310 | 123,719 | 344,863 | |
| 1992 | D | 184,300 | 151,990 | 378,840 | |
| 1988 | R | 169,860 | 197,956 | 371,008 | |
| 1984 | R | 160,225 | 229,005 | 390,308 | |
| 1980 | R | 130,136 | 198,552 | 365,149 | |
| 1976 | R | 173,153 | 208,527 | 384,296 | |
| 1972 | R | 154,412 | 262,901 | 418,435 | |
| 1968 | R | 173,954 | 201,652 | 400,807 | |
| 1964 | D | 243,723 | 149,052 | 393,235 | |
| 1960 | R | 171,410 | 224,562 | 396,663 | |
| 1956 | R | 104,857 | 271,906 | 376,763 | |
| 1952 | R | 113,358 | 237,105 | 352,170 | |
| 1948 | R | 95,681 | 177,077 | 290,611 | |
| 1944 | R | 107,591 | 174,635 | 282,982 | |
| 1940 | R | 110,114 | 182,883 | 293,691 | |
| 1936 | R | 123,561 | 133,670 | 261,569 | |
| 1932 | R | 101,435 | 112,747 | 220,788 | |
| 1928 | R | 80,926 | 109,939 | 195,544 | |
| 1924 | R | 30,964 | 85,029 | 133,035 | |
| 1920 | R | 28,060 | 76,020 | 111,335 | |
| 1916 | R | 22,457 | 34,693 | 58,380 | |
| 1912 | D | 21,160 | 15,843 | 53,711 | |
| 1908 | R | 18,346 | 29,438 | 50,422 | |
| 1904 | R | 18,093 | 25,101 | 44,879 | |
| 1900 | R | 16,439 | 21,256 | 38,727 | |
| 1896 | R | 11,752 | 19,337 | 32,434 | |
| 1892 | D | 16,088 | 13,456 | 31,139 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Westchester County's high median incomes and dense commuter suburbs have accompanied a steady leftward trend over two decades, culminating in a 26-point Democratic presidential margin in 2024 — one of the widest among large northeastern suburban counties.
The Democratic margin in Westchester County has been steady. It reached its modern peak at thirty-six points in 2020; the 2024 margin was twenty-six points, still in line with the county's long pattern.
Westchester County's political identity is inseparable from its demographic profile: a 52% non-Hispanic-white share, a median household income of $118,976, and the full diversity of a major metropolitan center. The county's voting pattern resembles other major urban centers most closely — Union County and Shelby County.
