# 1940 United States Senate election in Pennsylvania

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vte :
The 1940 United States Senate election in Pennsylvania was held on November 5, 1940. Incumbent Democratic U.S. Senator Joseph F. Guffey successfully sought re-election to another term, defeating the Republican nominee, Jay Cooke.
As of 2023, this is the last time that Mifflin County and Montour County voted Democratic in a Senate election. This was also the last time until 1991 that Democrats won this Senate seat, and the last until 2006 that they were elected to this seat for a full term.

## General election
### Candidates

* Joseph F. Guffey, incumbent U.S. Senator (Democratic)
* Jay Cooke (Republican)

### Results

General election results :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Joseph F. Guffey (inc.) | 2,069,980 | 51.79% | 1.01 |
| | Republican | Jay Cooke | 1,893,104 | 47.36% | 0.90 |
| | Socialist | David H.H. Felix | 15,449 | 0.39% | |
| | Prohibition | H. B. Mansell | 11,113 | 0.28% | 0.40 |
| | Communist | Carl Reeve | 4,761 | 0.12% | 0.09 |
| | Socialist Labor | Frank Knotek | 2,503 | 0.06% | 0.10 |
| | Write-in | Write-in | 110 | 0.00% | |
| Totals | Totals | Totals | 3,997,020 | 100.00% | |