| Year | Democratic | Republican | Other
|
| 2004 | Jeff Seemann: 99,210 | Ralph S. Regula: 197,990 |
|
| 2002 | Jim Rice: 58,644 | Ralph S. Regula: 129,734 |
|
| 2000 | William Smith: 62,709 | Ralph S. Regula: 162,294 | Richard L. Shetler (L): 6,166
Brad Graef (N): 3,231
|
| 1998 | Peter D. Ferguson: 66,047 | Ralph S. Regula: 117,426 |
|
| 1996 | Thomas E. Burkhart: 64,902 | Ralph S. Regula: 159,314 | Brad Graef (N): 7,611
|
| 1994 | J. Michael Finn: 45,781 | Ralph S. Regula: 137,322 |
|
| 1992 | Warner D. Mendenhall: 90,224 | Ralph S. Regula: 158,489 |
|
| 1990 | Warner D. Mendenhall: 70,516 | Ralph S. Regula: 101,097 |
|
| 1988 | Melvin J. Gravely: 43,356 | Ralph S. Regula: 158,824 |
|
| 1986 | William J. Kennick: 36,639 | Ralph S. Regula: 118,206 |
|
| 1984 | James Gwin: 58,048 | Ralph S. Regula: 152,399 |
|
| 1982 | Jeffrey R. Orenstein: 57,386 | Ralph S. Regula: 110,485 |
|
| 1980 | Larry V. Slagle: 39,219 | Ralph S. Regula: 149,960 |
|
| 1978 | Owen S. Hand Jr.: 29,640 | Ralph S. Regula: 105,152 |
|
| 1976 | John G. Freedom: 55,671 | Ralph S. Regula: 116,374 | Harold B. Festerly (A): 1,969
Mark F. Vanvoorhis (W): 77
|
| 1974 | John G. Freedom: 48,754 | Ralph S. Regula: 92,986 |
|
| 1972 | Virgil L. Musser: 75,929 | Ralph S. Regula: 102,013 |
|
| 1970 | Virgil L. Musser: 63,187 | Frank T. Bow: 81,208 |
|
| 1968 | Virgil L. Musser: 68,916 | Frank T. Bow: 101,495 |
|
| 1966 | Robert D. Freeman: 55,775 | Frank T. Bow: 87,597 |
|
| 1964 | Robert D. Freeman: 93,255 | Frank T. Bow: 101,808 |
|
| 1962 | Ed Witmer: 64,213 | Frank T. Bow: 96,512 |
|
| 1960 | John G. Freedom: 78,257 | Frank T. Bow: 130,542 |
|
| 1958 | John G. Freedom: 74,660 | Frank T. Bow: 100,678 |
|
| 1956 | John McSweeney: 82,206 | Frank T. Bow: 101,324 |
|
| 1954 | Thomas H. Nichols: 56,787 | Frank T. Bow: 79,371 |
|
| 1952 | John McSweeney: 82,522 | Frank T. Bow: 98,447 |
|
| 1950 | John McSweeney: 75,255 | Frank T. Bow: 77,306 |
|
| 1948 | John McSweeney: 79,859 | Henderson H. Carson: 71,871 |
|
| 1946 | William R. Thom: 51,934 | Henderson H. Carson: 65,639 |
|
| 1944 | William R. Thom: 85,755 | Henderson H. Carson: 75,921 | Harry T. Whiteleather: 1,149
|
| 1942 | William R. Thom: 45,531 | Henderson H. Carson: 50,657 |
|
| 1940 | William R. Thom: 92,469 | James Seccombe: 71,629 |
|
| 1938 | William R. Thom: 60,382 | James Seccombe: 62,176 |
|
| 1936 | William R. Thom: 89,911 | H. Ross Ake: 54,979 | A. M. Hickey: 4,552
Jacob S. Coxey Sr. (U): 2,384
|
| 1934 | William R. Thom: 59,354 | Charles B. McClintock: 45,390 |
|
| 1932 | William R. Thom: 67,670 | Charles B. McClintock: 63,609 |
|
| 1930 | William R. Thom: 47,237 | Charles B. McClintock: 51,113 |
|
| 1928 | John McSweeney: 55,778 | Charles B. McClintock: 73,966 | Jacob S. Coxey Sr.: 1,428
Carl Guillod (W): 92
|
| 1926 | John McSweeney: 40,283 | Charles B. McClintock: 27,116 |
|
| 1924 | John McSweeney: 51,491 | Thomas C. Hunsicker: 45,559 | Jacob S. Coxey Sr.: 2,901
|
| 1922 | John McSweeney: 43,590 | Joseph H. Himes: 39,881 |
|
| 1920 | John McSweeney: 42,799 | Joseph H. Himes: 56,584 |
|
