| Rank | Congressional District | Percentage of Black or African American Residents | 
|---|---|---|
| 1 | Iowa 2nd Congressional District | 3.7% | 
| 2 | Iowa 3rd Congressional District | 3.7% | 
| 3 | Iowa 1st Congressional District | 3.2% | 
| 4 | Iowa 4th Congressional District | 1.3% | 
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