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County results Chapman: 50–60% 60–70% 70–80% 80–90% Cooper: 40–50% 50–60% 60–70% 70–80% 80–90% | |||||||||||||||||
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The1948 United States Senate election in Kentucky took place on November 2, 1948. Incumbent Republican SenatorJohn Sherman Cooper, who won a 1946 special election to fill the vacant seat of Commissioner of BaseballHappy Chandler, ran for a full term in office but was defeated by Democratic U.S. RepresentativeVirgil Chapman.

| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Virgil Chapman | 102,860 | 50.06 | |
| Democratic | John Y. Brown, Sr. | 90,740 | 44.16 | |
| Democratic | Milton Whiteworth | 10,852 | 5.28 | |
| Democratic | D. E. McQueary | 1,010 | 0.49 | |
| Total votes | 205,462 | 100.00 | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Virgil Chapman | 408,256 | 51.39% | ||
| Republican | John Sherman Cooper (incumbent) | 383,776 | 48.31% | ||
| Socialist | W. A. Standefur | 1,232 | 0.16% | ||
| Progressive | H. G. Stanfield | 924 | 0.12% | ||
| Socialist Labor | David R. Cox | 254 | 0.03% | ||
| Democratic | John Y. Brown (write-in) | 26 | 0.00% | ||
| Independent | O. G. Gaines (write-in) | 1 | 0.00% | ||
| Total votes | 794,469 | 100.00% | |||
| Democraticgain fromRepublican | Swing | ||||