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|   County results  Branstad: 50-60% 60-70% 70-80% 80-90% Avenson: 50–60% | |||||||||||||||||
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| Elections in Iowa | 
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The 1990 Iowa gubernatorial election took place November 8, 1990. Incumbent Republican Governor of Iowa Terry Branstad ran for re-election to a third term as governor. On the Democratic side, state representative Donald Avenson won his party's nomination and both Branstad and Avenson moved on to the general election. Branstad won re-election to a third term as governor, defeating Avenson by a margin of over 20 points.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Donald Avenson | 79,022 | 39.45 | |
| Democratic | Tom Miller | 63,364 | 31.63 | |
| Democratic | John Crystal | 52,170 | 26.05 | |
| Democratic | Jo Ann Zimmerman | 4,475 | 2.23 | |
| Democratic | Darold Powers | 1,167 | 0.58 | |
| Democratic | Write-ins | 107 | 0.05 | |
| Total votes | 200,305 | 100.00 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Terry Branstad (inc.) | 94,253 | 99.52 | |
| Republican | Write-ins | 453 | 0.47 | |
| Total votes | 94,706 | 100.00 | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | Terry Branstad (inc.) | 591,852 | 60.61% | +8.70% | |
| Democratic | Donald Avenson | 379,372 | 38.85% | −9.14% | |
| Socialist Workers | Nan Bailey | 4,263 | 0.44% | ||
| Write-ins | 996 | 0.10% | |||
| Turnout | 976,483 | ||||
| Republican hold | Swing | ||||
{{cite web}}:  CS1 maint: archived copy as title (link)