| Rank | No Fuel Used Heating House Percentage ▼ | School District / Population |
| 1. | 1.7% | Deep River School District / 4,644 |
| 2. | 1.5% | Essex School District / 6,686 |
| 3. | 1.2% | Regional High School District 04 / 15,306 |
| 4. | 1.1% | Salisbury School District / 3,810 |
| 5. | 1.0% | Madison School District / 18,229 |
| 6. | 1.0% | Portland School District / 9,422 |
| 7. | 0.8% | East Hampton School District / 12,891 |
| 8. | 0.8% | Clinton School District / 13,316 |
| 9. | 0.7% | Winchester School District / 11,221 |
| 10. | 0.7% | Oxford School District / 12,192 |
| 11. | 0.6% | Andover School District / 3,246 |
| 12. | 0.6% | Voluntown School District / 2,603 |
| 13. | 0.6% | Litchfield School District / 8,512 |
| 14. | 0.5% | Middletown School District / 47,349 |
| 15. | 0.5% | Westbrook School District / 6,860 |
| 15. | 0.5% | East Hartford School District / 50,974 |
| 15. | 0.5% | New Hartford School District / 6,868 |
| 18. | 0.5% | Killingly School District / 17,347 |
| 18. | 0.5% | New Haven School District / 128,885 |
| 20. | 0.4% | Norwich School District / 39,843 |
| 21. | 0.4% | Pomfret School District / 4,197 |
| 22. | 0.3% | Old Saybrook School District / 10,326 |
| 23. | 0.3% | Hartford School District / 124,760 |
| 24. | 0.3% | Weston School District / 10,088 |
| 24. | 0.3% | Granby School District / 11,124 |
| 24. | 0.3% | Groton School District / 40,254 |
| 27. | 0.3% | Regional High School District 01 / 15,732 |
| 27. | 0.3% | Ansonia School District / 19,163 |
| 29. | 0.3% | Regional High School District 07 / 13,679 |
| 29. | 0.3% | Manchester School District / 57,650 |
| 29. | 0.3% | Putnam School District / 9,564 |
| 32. | 0.2% | Regional School District 13 / 11,706 |
| 32. | 0.2% | Bridgeport School District / 142,576 |
| 32. | 0.2% | West Haven School District / 55,070 |
| 35. | 0.2% | Tolland School District / 14,809 |
| 36. | 0.2% | Shelton School District / 39,061 |
| 36. | 0.2% | Stamford School District / 120,907 |
| 36. | 0.2% | Hamden School District / 60,293 |
| 39. | 0.2% | West Hartford School District / 62,898 |
| 39. | 0.2% | Rocky Hill School District / 19,418 |
| 41. | 0.2% | Berlin School District / 19,591 |
| 42. | 0.2% | Waterbury School District / 109,941 |
| 43. | 0.2% | Wallingford School District / 44,786 |
| 44. | 0.2% | Name N/A / 216,484 |
| 45. | 0.2% | Torrington School District / 36,423 |
| 45. | 0.2% | Meriden School District / 60,484 |
| 47. | 0.1% | Cheshire School District / 29,183 |
| 48. | 0.1% | Enfield School District / 44,794 |
| 49. | 0.1% | Regional High School District 08 / 19,104 |
| 49. | 0.1% | East Haven School District / 29,074 |
| 49. | 0.1% | Bristol School District / 60,466 |
| 52. | 0.1% | Regional School District 16 / 15,191 |
| 52. | 0.1% | Farmington School District / 25,067 |
| 52. | 0.1% | Norwalk School District / 84,611 |
| 52. | 0.1% | Stratford School District / 50,821 |
| 56. | 0.1% | Naugatuck School District / 31,746 |
| 57. | 0.1% | Danbury School District / 79,371 |
| 57. | 0.1% | Regional School District 15 / 27,080 |
| 57. | 0.1% | Milford School District / 52,753 |
| 57. | 0.1% | Wethersfield School District / 26,613 |
| 61. | 0.1% | Branford School District / 28,194 |
| 62. | 0.1% | New Britain School District / 72,954 |
| 62. | 0.1% | New London School District / 27,496 |
| 62. | 0.1% | Greenwich School District / 60,809 |
| 62. | 0.1% | Fairfield School District / 58,727 |
| 66. | 0.0% | Trumbull School District / 35,495 |
Please note that we only rank locations with 'No Fuel Used Heating House Percentage' data. The rank above might not be a complete list. Locations without 'No Fuel Used Heating House Percentage' data are not listed.
*ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
