| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 439 | 1,493 | 1,970 | |
| 2020 | R | 497 | 1,585 | 2,128 | |
| 2016 | R | 431 | 1,437 | 2,071 | |
| 2012 | R | 660 | 1,465 | 2,178 | |
| 2008 | R | 792 | 1,301 | 2,139 | |
| 2004 | R | 686 | 1,475 | 2,195 | |
| 2000 | R | 500 | 1,348 | 1,971 | |
| 1996 | R | 671 | 1,017 | 1,974 | |
| 1992 | R | 761 | 1,099 | 2,431 | |
| 1988 | R | 1,008 | 1,422 | 2,477 | |
| 1984 | R | 691 | 1,883 | 2,626 | |
| 1980 | R | 517 | 2,273 | 2,988 | |
| 1976 | D | 1,434 | 1,396 | 2,887 | |
| 1972 | R | 973 | 1,970 | 2,978 | |
| 1968 | R | 1,048 | 1,700 | 2,979 | |
| 1964 | D | 1,893 | 1,178 | 3,073 | |
| 1960 | D | 1,848 | 1,464 | 3,313 | |
| 1956 | R | 1,340 | 1,997 | 3,342 | |
| 1952 | R | 773 | 2,806 | 3,608 | |
| 1948 | R | 1,147 | 1,738 | 2,953 | |
| 1944 | R | 1,307 | 1,992 | 3,316 | |
| 1940 | R | 1,451 | 2,349 | 3,811 | |
| 1936 | D | 2,168 | 912 | 3,764 | |
| 1932 | D | 2,439 | 856 | 3,333 | |
| 1928 | D | 1,606 | 1,469 | 3,086 | |
| 1924 | R | 157 | 1,160 | 2,474 | |
| 1920 | R | 294 | 2,102 | 2,485 | |
| 1916 | D | 789 | 703 | 1,588 | |
| 1912 | D | 453 | 264 | 1,179 | |
| 1908 | R | 610 | 884 | 1,541 | |
| 1904 | R | 284 | 921 | 1,255 | |
| 1900 | R | 276 | 535 | 824 | |
| 1896 | R | 75 | 222 | 298 | |
| 1892 | R | 0 | 121 | 175 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Pierce County delivered a 53.5-point Republican margin in 2024, typical of the heavily rural, agricultural counties of north-central North Dakota where presidential contests have been noncompetitive for decades.
The Democratic margin in Pierce County peaked at forty-seven points in 1932. By 1980 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-four points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Pierce County's median household income of $59,365 sits well below state and national norms, and 11% 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 Adams County and Boundary County.