| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,508 | 2,715 | 4,287 | |
| 2020 | R | 1,596 | 2,738 | 4,418 | |
| 2016 | R | 1,530 | 2,453 | 4,305 | |
| 2012 | D | 2,350 | 1,744 | 4,172 | |
| 2008 | D | 2,567 | 1,612 | 4,257 | |
| 2004 | D | 2,286 | 1,795 | 4,123 | |
| 2000 | D | 2,208 | 1,659 | 4,004 | |
| 1996 | D | 2,293 | 1,284 | 4,012 | |
| 1992 | D | 2,009 | 1,382 | 4,448 | |
| 1988 | D | 2,440 | 1,488 | 3,982 | |
| 1984 | D | 2,263 | 1,985 | 4,266 | |
| 1980 | R | 1,721 | 2,247 | 4,310 | |
| 1976 | D | 2,399 | 1,964 | 4,425 | |
| 1972 | R | 2,034 | 2,564 | 4,636 | |
| 1968 | R | 1,815 | 2,383 | 4,420 | |
| 1964 | D | 2,936 | 1,777 | 4,723 | |
| 1960 | R | 2,303 | 2,740 | 5,048 | |
| 1956 | R | 2,465 | 2,700 | 5,167 | |
| 1952 | R | 2,075 | 3,315 | 5,404 | |
| 1948 | D | 2,623 | 1,878 | 4,637 | |
| 1944 | D | 2,629 | 2,086 | 4,725 | |
| 1940 | D | 3,007 | 2,434 | 5,455 | |
| 1936 | D | 2,976 | 1,964 | 4,984 | |
| 1932 | D | 2,640 | 1,690 | 4,395 | |
| 1928 | R | 1,310 | 2,921 | 4,321 | |
| 1924 | R | 180 | 2,340 | 4,591 | |
| 1920 | R | 516 | 3,401 | 4,009 | |
| 1916 | R | 566 | 1,463 | 2,077 | |
| 1912 | D | 402 | 354 | 1,982 | |
| 1908 | R | 449 | 1,433 | 1,928 | |
| 1904 | R | 307 | 1,659 | 2,024 | |
| 1900 | R | 475 | 1,730 | 2,238 | |
| 1896 | R | 584 | 1,696 | 2,300 | |
| 1892 | R | 614 | 1,273 | 1,974 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Worth County's roughly 8,000 residents are concentrated in small agricultural towns, and its R+28 presidential margin in 2024 reflects the broader rural realignment reshaping Iowa's once-competitive political map.
The county's recent history is a story of close margins. The Democratic margin reached twenty-five points in 1996; the Republican margin reached seventy-two points in 1920. Most other elections have been decided by single-digit points.
Worth County's demographics — a population of 7,350, a 95% non-Hispanic-white share, a median household income of $78,008 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Jackson County and Buchanan County.
