| 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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