| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 785 | 2,146 | 3,019 | |
| 2020 | R | 865 | 2,116 | 3,074 | |
| 2016 | R | 699 | 1,666 | 2,758 | |
| 2012 | R | 982 | 1,870 | 2,903 | |
| 2008 | R | 1,027 | 1,754 | 2,842 | |
| 2004 | R | 829 | 2,105 | 2,958 | |
| 2000 | R | 755 | 1,872 | 2,709 | |
| 1996 | R | 1,070 | 1,501 | 2,936 | |
| 1992 | R | 837 | 1,352 | 2,977 | |
| 1988 | R | 1,095 | 1,838 | 2,981 | |
| 1984 | R | 678 | 2,298 | 3,004 | |
| 1980 | R | 727 | 2,235 | 3,143 | |
| 1976 | R | 1,286 | 1,374 | 2,750 | |
| 1972 | R | 625 | 1,405 | 2,180 | |
| 1968 | R | 582 | 1,222 | 2,028 | |
| 1964 | D | 1,161 | 966 | 2,127 | |
| 1960 | R | 960 | 1,065 | 2,025 | |
| 1956 | R | 769 | 1,108 | 1,877 | |
| 1952 | R | 603 | 1,308 | 1,911 | |
| 1948 | R | 795 | 875 | 1,681 | |
| 1944 | R | 801 | 895 | 1,696 | |
| 1940 | R | 931 | 951 | 1,885 | |
| 1936 | D | 1,075 | 708 | 1,812 | |
| 1932 | D | 1,126 | 603 | 1,736 | |
| 1928 | R | 653 | 852 | 1,508 | |
| 1924 | R | 314 | 757 | 1,755 | |
| 1920 | R | 561 | 1,155 | 1,716 | |
| 1916 | D | 1,079 | 1,024 | 2,160 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Power County anchors Idaho's farming interior, where irrigated agriculture along the Snake River plain shapes both the economy and a persistently lopsided Republican tilt — the 2024 presidential margin exceeded 45 points.
The Democratic margin in Power County peaked at thirty points in 1932. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-five points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Power County's median household income of $61,146 sits well below state and national norms, and 10% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Humboldt County and Elmore County.