| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 10,171 | 14,417 | 25,392 | |
| 2020 | R | 9,796 | 12,815 | 23,317 | |
| 2016 | R | 8,399 | 11,272 | 21,376 | |
| 2012 | R | 10,235 | 10,397 | 21,020 | |
| 2008 | D | 11,803 | 9,812 | 22,107 | |
| 2004 | D | 11,176 | 10,437 | 21,876 | |
| 2000 | D | 8,559 | 8,169 | 17,962 | |
| 1996 | D | 7,970 | 4,599 | 15,000 | |
| 1992 | D | 7,824 | 4,844 | 17,272 | |
| 1988 | D | 8,659 | 6,045 | 14,789 | |
| 1984 | R | 7,289 | 7,612 | 15,003 | |
| 1980 | D | 7,312 | 6,209 | 15,646 | |
| 1976 | D | 8,039 | 5,676 | 14,064 | |
| 1972 | R | 5,611 | 5,899 | 11,716 | |
| 1968 | R | 4,783 | 4,990 | 10,234 | |
| 1964 | D | 6,351 | 3,291 | 9,666 | |
| 1960 | R | 4,317 | 5,632 | 9,958 | |
| 1956 | R | 3,644 | 5,782 | 9,458 | |
| 1952 | R | 3,241 | 6,763 | 10,021 | |
| 1948 | D | 4,395 | 3,753 | 8,306 | |
| 1944 | R | 3,033 | 5,137 | 8,233 | |
| 1940 | R | 3,259 | 6,624 | 9,999 | |
| 1936 | D | 4,061 | 3,935 | 9,216 | |
| 1932 | D | 4,115 | 3,537 | 7,980 | |
| 1928 | R | 3,017 | 6,491 | 9,595 | |
| 1924 | R | 298 | 2,788 | 6,805 | |
| 1920 | R | 644 | 4,441 | 5,375 | |
| 1916 | R | 1,650 | 1,945 | 3,749 | |
| 1912 | R | 985 | 986 | 3,385 | |
| 1908 | R | 978 | 2,988 | 4,172 | |
| 1904 | R | 594 | 3,492 | 4,244 | |
| 1900 | R | 1,041 | 3,433 | 4,706 | |
| 1896 | R | 1,412 | 3,724 | 5,336 | |
| 1892 | R | 1,210 | 2,315 | 4,015 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Pierce County sits on Wisconsin's western edge across from the Twin Cities metro, drawing suburban and rural residents whose voting patterns have trended Republican by double digits over the past decade despite the county's proximity to a major Democratic urban center.
The county's recent history is a story of close margins. The Democratic margin reached thirty-two points in 1964; the Republican margin reached seventy-one points in 1920. Most other elections have been decided by single-digit points.
Pierce County's demographics — a population of 42,584, a 92% non-Hispanic-white share, a median household income of $92,109 — 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 Cowlitz County and Columbia County.