| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 83,483 | 100,276 | 185,080 | |
| 2020 | R | 84,137 | 86,831 | 172,169 | |
| 2016 | R | 66,881 | 70,289 | 140,847 | |
| 2012 | D | 65,869 | 56,202 | 123,027 | |
| 2008 | D | 67,125 | 52,512 | 120,579 | |
| 2004 | D | 51,835 | 47,592 | 100,063 | |
| 2000 | D | 41,560 | 34,705 | 77,990 | |
| 1996 | D | 36,169 | 28,899 | 73,906 | |
| 1992 | R | 23,876 | 24,400 | 68,233 | |
| 1988 | R | 17,446 | 32,319 | 50,079 | |
| 1984 | R | 13,040 | 28,200 | 41,247 | |
| 1980 | R | 10,347 | 18,126 | 29,830 | |
| 1976 | D | 12,386 | 11,502 | 24,209 | |
| 1972 | R | 4,593 | 14,258 | 18,910 | |
| 1968 | R | 5,232 | 7,281 | 16,923 | |
| 1964 | D | 7,748 | 7,204 | 14,952 | |
| 1960 | R | 5,360 | 6,354 | 11,714 | |
| 1956 | R | 2,731 | 5,435 | 8,166 | |
| 1952 | R | 2,782 | 4,667 | 7,449 | |
| 1948 | D | 1,704 | 1,689 | 4,440 | |
| 1944 | D | 2,129 | 920 | 3,049 | |
| 1940 | D | 2,169 | 962 | 3,131 | |
| 1936 | D | 1,946 | 497 | 2,443 | |
| 1932 | D | 1,602 | 390 | 1,992 | |
| 1928 | R | 741 | 983 | 1,759 | |
| 1924 | D | 722 | 524 | 1,418 | |
| 1920 | D | 1,167 | 707 | 1,997 | |
| 1916 | D | 703 | 134 | 1,020 | |
| 1912 | D | 352 | 45 | 506 | |
| 1908 | D | 280 | 63 | 434 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
St. Lucie sits on Florida's Treasure Coast with a majority-minority population that nonetheless delivered a 9-point Republican margin in 2024, reflecting a broader realignment among working-class and Hispanic voters statewide.
The Democratic margin in St. Lucie County has rarely exceeded sixty-one points in modern history; the Republican margin has rarely exceeded fifty-one points. 2024 delivered the county to the Republican candidate by nine points.
St. Lucie County's demographics resemble the country more than they resemble most counties. A 57% non-Hispanic-white share, a 12% poverty rate, and a median household income of $71,457 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Pinellas County and Suffolk County.
