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Senatorial Candidate | Political Party | Popular Vote |
| Tom Harkin | Democratic |
529,571 |
53.82% |
| Tom Tauke | Republican |
453,273 |
46.07% |
| Write-ins | - |
1,089 |
0.11% |
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Map Key
| Turnout
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Maps | | | Pop. (m) | Dem. (m) | Rep. (m) |
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| Election Notes:
- Figures above reflect correction of the data in Sioux County. Official Canvass swapped figures for Harkin and Tauke in Sioux County. Totals from the canvass are: Harkin: 535,975, Tauke: 446,869.
| Demographic Data
1990 Population: | 2,776,831 | Enum. | 1990 Population Density: | 19.2 | persons/km2 | 1980 Population: | 2,913,808 | Enum. | 1980 Population Density: | 20.1 | persons/km2 | Land Area (2000): | 144,701 | km2 | Annual Pop Growth Rate: | -0.5 | % |
| Election Data and Statistics:
| Election Tools
- Atlas Forum Image Code for Maps: County, Pop
Data Sources:
- Source for Popular Vote data: Iowa Secretary of State, comp., "United States Senator," 1990 General Election November 6, 1990 Official Canvass Summary (Des Moines, 1990)
- Source for Population data: U.S. Census Bureau.
| Results for and Individual County:
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