| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 568,571 | 144,311 | 723,610 | |
| 2020 | D | 603,790 | 132,740 | 741,377 | |
| 2016 | D | 584,025 | 108,748 | 709,618 | |
| 2012 | D | 588,806 | 96,467 | 690,776 | |
| 2008 | D | 595,980 | 117,221 | 717,329 | |
| 2004 | D | 542,205 | 130,099 | 674,069 | |
| 2000 | D | 449,182 | 100,959 | 561,180 | |
| 1996 | D | 412,988 | 85,345 | 533,277 | |
| 1992 | D | 434,904 | 133,328 | 638,058 | |
| 1988 | D | 449,566 | 219,053 | 674,977 | |
| 1984 | D | 501,369 | 267,178 | 772,102 | |
| 1980 | D | 421,253 | 244,108 | 718,100 | |
| 1976 | D | 494,579 | 239,000 | 746,197 | |
| 1972 | D | 431,736 | 344,096 | 783,970 | |
| 1968 | D | 525,768 | 254,153 | 850,117 | |
| 1964 | D | 670,645 | 239,733 | 913,472 | |
| 1960 | D | 622,544 | 291,000 | 915,277 | |
| 1956 | D | 507,289 | 383,414 | 892,321 | |
| 1952 | D | 557,352 | 396,874 | 958,547 | |
| 1948 | D | 432,699 | 425,962 | 885,297 | |
| 1944 | D | 496,367 | 346,380 | 845,630 | |
| 1940 | D | 532,149 | 354,878 | 891,518 | |
| 1936 | D | 539,757 | 329,881 | 892,948 | |
| 1932 | R | 260,276 | 331,092 | 607,019 | |
| 1928 | R | 276,573 | 420,320 | 700,596 | |
| 1924 | R | 54,213 | 347,457 | 447,022 | |
| 1920 | R | 90,151 | 307,826 | 419,212 | |
| 1916 | R | 90,800 | 194,163 | 290,610 | |
| 1912 | R | 66,308 | 91,944 | 251,690 | |
| 1908 | R | 75,310 | 185,263 | 268,141 | |
| 1904 | R | 48,784 | 227,709 | 281,654 | |
| 1900 | R | 58,179 | 173,657 | 234,889 | |
| 1896 | R | 63,323 | 176,462 | 244,887 | |
| 1892 | R | 84,470 | 116,685 | 203,102 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Philadelphia's D+58.8 margin in 2024 makes it the single largest vote-generating engine for Democrats in Pennsylvania, with a dense urban electorate that consistently offsets Republican advantages across the state's rural interior.
The Democratic margin in Philadelphia County reached its widest at seventy-one points in 2012. The margin in 2024 was fifty-nine points — still decisive.
Philadelphia County's loyalty is rooted in its place. Median household income of $61,953, a 35% non-Hispanic-white share, and a population of 1,579,706 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 Claiborne County and Cuyahoga County.
