| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 17,216 | 41,961 | 59,846 | |
| 2020 | R | 16,971 | 41,462 | 59,254 | |
| 2016 | R | 13,020 | 35,627 | 51,131 | |
| 2012 | R | 15,203 | 30,658 | 46,669 | |
| 2008 | R | 18,381 | 30,280 | 49,237 | |
| 2004 | R | 15,681 | 33,961 | 50,081 | |
| 2000 | R | 14,663 | 27,137 | 43,193 | |
| 1996 | R | 13,516 | 21,535 | 39,241 | |
| 1992 | R | 13,315 | 20,536 | 43,172 | |
| 1988 | R | 13,528 | 24,792 | 38,735 | |
| 1984 | R | 13,147 | 28,498 | 41,895 | |
| 1980 | R | 14,609 | 23,415 | 40,553 | |
| 1976 | R | 18,635 | 22,648 | 42,082 | |
| 1972 | R | 11,999 | 28,913 | 42,087 | |
| 1968 | R | 16,888 | 23,830 | 43,566 | |
| 1964 | D | 25,879 | 19,011 | 44,945 | |
| 1960 | R | 18,351 | 30,083 | 48,482 | |
| 1956 | R | 13,490 | 27,030 | 40,540 | |
| 1952 | R | 15,870 | 25,753 | 41,807 | |
| 1948 | R | 13,692 | 19,118 | 33,436 | |
| 1944 | R | 15,658 | 19,886 | 35,741 | |
| 1940 | R | 18,363 | 21,423 | 39,953 | |
| 1936 | D | 19,376 | 18,315 | 38,290 | |
| 1932 | R | 11,499 | 16,212 | 29,250 | |
| 1928 | R | 7,132 | 28,720 | 36,137 | |
| 1924 | R | 6,857 | 14,039 | 23,916 | |
| 1920 | R | 5,853 | 10,570 | 18,635 | |
| 1916 | D | 6,640 | 6,010 | 14,473 | |
| 1912 | D | 6,039 | 1,631 | 14,827 | |
| 1908 | R | 7,144 | 8,708 | 17,150 | |
| 1904 | R | 6,424 | 8,928 | 16,879 | |
| 1900 | R | 7,427 | 7,750 | 16,304 | |
| 1896 | R | 7,340 | 8,097 | 16,668 | |
| 1892 | D | 7,532 | 5,736 | 14,234 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lycoming County, anchored by Williamsport in the north-central Susquehanna Valley, has shifted decisively toward Republican presidential candidates over the past decade, posting a 41.5-point margin in 2024 that ranks among the state's largest outside its major metro areas.
The Democratic margin in Lycoming County peaked at thirty points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Lycoming County's median household income of $63,917 sits well below state and national norms, and 13% 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 Wells County and Adams County.