| Rank | Congressional District | Population (2012) | 
|---|---|---|
| 1 | Colorado 1st Congressional District | 750,153 | 
| 2 | Colorado 6th Congressional District | 748,467 | 
| 3 | Colorado 7th Congressional District | 746,027 | 
| 4 | Colorado 2nd Congressional District | 743,592 | 
| 5 | Colorado 5th Congressional District | 740,514 | 
| 6 | Colorado 4th Congressional District | 738,491 | 
| 7 | Colorado 3rd Congressional District | 720,338 | 
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