| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 6,202 | 9,591 | 16,169 | |
| 2020 | R | 6,747 | 10,182 | 17,309 | |
| 2016 | R | 5,068 | 8,668 | 15,116 | |
| 2012 | R | 5,373 | 8,588 | 14,294 | |
| 2008 | R | 6,318 | 9,006 | 15,613 | |
| 2004 | R | 5,331 | 9,534 | 15,110 | |
| 2000 | R | 4,591 | 8,271 | 13,684 | |
| 1996 | R | 4,918 | 8,382 | 14,504 | |
| 1992 | R | 5,047 | 6,259 | 15,006 | |
| 1988 | R | 5,503 | 6,893 | 12,711 | |
| 1984 | R | 4,599 | 8,507 | 13,280 | |
| 1980 | R | 4,173 | 7,045 | 12,912 | |
| 1976 | R | 6,003 | 6,624 | 12,987 | |
| 1972 | R | 3,555 | 8,287 | 12,327 | |
| 1968 | R | 3,351 | 6,682 | 10,841 | |
| 1964 | D | 5,306 | 4,979 | 10,415 | |
| 1960 | R | 3,537 | 7,798 | 11,404 | |
| 1956 | R | 3,084 | 7,367 | 10,494 | |
| 1952 | R | 2,726 | 7,154 | 10,095 | |
| 1948 | R | 3,615 | 5,270 | 9,130 | |
| 1944 | R | 3,300 | 5,339 | 8,703 | |
| 1940 | R | 4,087 | 5,539 | 9,759 | |
| 1936 | D | 5,357 | 4,456 | 9,841 | |
| 1932 | R | 4,091 | 4,192 | 8,507 | |
| 1928 | R | 1,748 | 6,330 | 8,155 | |
| 1924 | R | 1,744 | 4,499 | 7,630 | |
| 1920 | R | 2,457 | 4,454 | 7,060 | |
| 1916 | R | 3,131 | 3,479 | 7,103 | |
| 1912 | D | 1,499 | 703 | 3,972 | |
| 1908 | R | 1,475 | 2,305 | 3,954 | |
| 1904 | R | 690 | 2,362 | 3,343 | |
| 1900 | R | 1,658 | 2,266 | 4,000 | |
| 1896 | R | 1,678 | 2,082 | 3,815 | |
| 1892 | R | 0 | 1,756 | 3,835 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Harvey County anchors around Newton, a historic Mennonite settlement and former railroad hub, giving it a modest urban-rural mix that has nonetheless tracked reliably Republican in recent presidential cycles by margins exceeding 20 points.
The Republican margin in Harvey County reached its widest at fifty-six points in 1928. The margin in 2024 was twenty-one points, in line with the county's deep historical pattern.
Harvey County's loyalty is rooted in its place. Median household income of $74,368, a 84% non-Hispanic-white share, and a population of 33,756 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 Ford County and McPherson County.
