| Rank | No Fuel Used Heating House Percentage ▼ | School District / Population |
| 1. | 2.2% | Deep River School District / 4,680 |
| 2. | 1.5% | Essex School District / 6,763 |
| 3. | 1.3% | Regional High School District 04 / 15,272 |
| 4. | 1.2% | East Hampton School District / 12,507 |
| 5. | 0.9% | Portland School District / 9,536 |
| 6. | 0.8% | Oxford School District / 12,368 |
| 7. | 0.6% | Westbrook School District / 6,624 |
| 8. | 0.5% | New Hartford School District / 6,722 |
| 9. | 0.5% | Killingly School District / 17,608 |
| 10. | 0.5% | Shelton School District / 39,669 |
| 10. | 0.5% | Ansonia School District / 18,530 |
| 12. | 0.4% | Salisbury School District / 3,995 |
| 13. | 0.4% | New Haven School District / 123,628 |
| 13. | 0.4% | Madison School District / 18,726 |
| 15. | 0.4% | Granby School District / 11,132 |
| 16. | 0.4% | Meriden School District / 59,078 |
| 17. | 0.4% | Groton School District / 40,114 |
| 17. | 0.4% | Stratford School District / 48,930 |
| 19. | 0.3% | Pomfret School District / 4,145 |
| 19. | 0.3% | Litchfield School District / 8,667 |
| 21. | 0.3% | Old Saybrook School District / 10,517 |
| 22. | 0.3% | West Haven School District / 52,727 |
| 23. | 0.3% | Hartford School District / 123,925 |
| 23. | 0.3% | Winchester School District / 10,765 |
| 23. | 0.3% | Tolland School District / 14,653 |
| 26. | 0.3% | Waterbury School District / 106,909 |
| 27. | 0.3% | Hamden School District / 57,863 |
| 27. | 0.3% | Stafford School District / 11,802 |
| 27. | 0.3% | Middletown School District / 47,702 |
| 30. | 0.3% | Regional High School District 07 / 13,657 |
| 31. | 0.3% | Putnam School District / 9,272 |
| 32. | 0.2% | East Hartford School District / 48,627 |
| 33. | 0.2% | Regional School District 06 / 7,032 |
| 33. | 0.2% | Berlin School District / 20,059 |
| 33. | 0.2% | Stamford School District / 118,787 |
| 36. | 0.2% | Bridgeport School District / 136,715 |
| 37. | 0.2% | Torrington School District / 35,495 |
| 38. | 0.2% | New Fairfield School District / 14,043 |
| 38. | 0.2% | Norwich School District / 36,596 |
| 40. | 0.2% | West Hartford School District / 60,573 |
| 40. | 0.2% | Enfield School District / 45,060 |
| 42. | 0.2% | Rocky Hill School District / 18,731 |
| 42. | 0.2% | Windham School District / 23,671 |
| 42. | 0.2% | Regional School District 14 / 13,233 |
| 45. | 0.1% | Name N/A / 213,921 |
| 45. | 0.1% | Newtown School District / 26,679 |
| 47. | 0.1% | Farmington School District / 24,935 |
| 48. | 0.1% | East Haven School District / 28,539 |
| 48. | 0.1% | Bristol School District / 60,869 |
| 50. | 0.1% | Norwalk School District / 83,219 |
| 50. | 0.1% | Vernon School District / 29,734 |
| 52. | 0.1% | Regional School District 15 / 26,800 |
| 52. | 0.1% | Regional High School District 01 / 15,925 |
| 52. | 0.1% | Milford School District / 55,293 |
| 55. | 0.1% | Danbury School District / 78,708 |
| 55. | 0.1% | Manchester School District / 55,740 |
| 55. | 0.1% | Wallingford School District / 44,601 |
| 58. | 0.1% | Wethersfield School District / 25,788 |
| 59. | 0.1% | Naugatuck School District / 31,827 |
| 59. | 0.1% | New Britain School District / 70,548 |
| 61. | 0.1% | Fairfield School District / 57,229 |
| 62. | 0.1% | Greenwich School District / 61,672 |
| 63. | 0.0% | New London School District / 26,123 |
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.
