United States Senate special election in Massachusetts, 2010 By county By county

| County | Coakley_ | Coakley_votes | Brown_ | Brown_votes | Kennedy_ | Kennedy_votes |
|---|---|---|---|---|---|---|
| Barnstable | 41.7% | 43609 | 57.4% | 59990 | 0.9% | 901 |
| Berkshire | 68.5% | 29847 | 30.5% | 13294 | 1.0% | 443 |
| Bristol | 42.8% | 71493 | 56.0% | 93474 | 1.2% | 1930 |
| Dukes | 64.3% | 4915 | 34.5% | 2641 | 1.2% | 92 |
| Essex | 42.6% | 108336 | 56.5% | 143897 | 0.9% | 2323 |
| Franklin | 62.7% | 17318 | 35.7% | 9876 | 1.6% | 446 |
| Hampden | 44.0% | 57813 | 54.5% | 71641 | 1.5% | 1950 |
| Hampshire | 61.4% | 34770 | 37.3% | 21107 | 1.3% | 712 |
| Middlesex | 51.7% | 283259 | 47.4% | 259768 | 0.8% | 4627 |
| Nantucket | 50.6% | 2139 | 48.0% | 2032 | 1.4% | 58 |
| Norfolk | 43.6% | 120041 | 55.5% | 152784 | 0.8% | 2262 |
| Plymouth | 36.6% | 49619 | 62.5% | 84680 | 0.8% | 1132 |
| Suffolk | 66.2% | 115774 | 32.8% | 57350 | 1.0% | 1807 |
| Worcester | 37.9% | 99803 | 60.9% | 160274 | 1.2% | 3087 |