| Rank | Congressional District | Population (2012) | 
|---|---|---|
| 1 | Massachusetts 2nd Congressional District | 745,433 | 
| 2 | Massachusetts 7th Congressional District | 745,166 | 
| 3 | Massachusetts 6th Congressional District | 745,067 | 
| 4 | Massachusetts 8th Congressional District | 743,817 | 
| 5 | Massachusetts 5th Congressional District | 743,098 | 
| 6 | Massachusetts 3rd Congressional District | 735,424 | 
| 7 | Massachusetts 4th Congressional District | 733,708 | 
| 8 | Massachusetts 9th Congressional District | 730,766 | 
| 9 | Massachusetts 1st Congressional District | 723,665 | 
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