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Senatorial Candidate | Political Party | Popular Vote |
| C. Wayland Brooks | Republican |
2,045,924 |
50.07% |
| James M. Slattery | Democratic |
2,025,097 |
49.56% |
| Other (+) | - |
15,158 |
0.37% |
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Map Key
| Turnout
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| Demographic Data
1940 Population: | 7,897,241 | Enum. | 1940 Population Density: | 54.9 | persons/km2 | 1930 Population: | 7,630,654 | Enum. | 1930 Population Density: | 53.0 | persons/km2 | Land Area (2000): | 143,961 | km2 | Annual Pop Growth Rate: | 0.3 | % |
| Election Data and Statistics:
- County Data (Table) (m)
- County Data (Graphs) (m)
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| | Election Tools
- Atlas Forum Image Code for Maps: County, Pop
Data Sources:
- Source for Popular Vote data: Printed by Authority of the State of Illinois, comp, "Vote for U.S. Senator (to fill a vacancy)," Official Vote Cast at the General Election of November 5, 1940 (Springfield: Allied Printing, 1941)
- Source for Population data: U.S. Census Bureau.
| Results for and Individual County:
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