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Senatorial Candidate | Political Party | Popular Vote |
| Joseph Medill McCormick | Republican |
479,967 |
50.50% |
| J. Hamilton Lewis | Democratic |
426,943 |
44.92% |
| William Bross Lloyd | Socialist |
37,167 |
3.91% |
| John M. Francis | Socialist Labor |
3,268 |
0.34% |
| Frank B. Vennum | Prohibition |
3,151 |
0.33% |
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Map Key
> 40% |
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> 50% |
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> 60% |
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> 70% |
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> 80% |
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| Turnout
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| Demographic Data
1920 Population: | 6,485,280 | Enum. | 1920 Population Density: | 45.0 | persons/km2 | 1910 Population: | 5,638,591 | Enum. | 1910 Population Density: | 39.2 | persons/km2 | Land Area (2000): | 143,961 | km2 | Annual Pop Growth Rate: | 1.4 | % |
| 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
Data Sources:
- Source for Popular Vote data: Printed by Authority of the State of Illinois, comp, "Vote on United States Senator," Official Vote of the State of Illinois Cast at the General Election of November 5, 1918 (Springfield: Illinois State Journal Company, 1919)
- Source for Population data: U.S. Census Bureau.
| Results for and Individual County:
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