| Waynflete School ✓ | Portland | PreK-12 | 520 | 6.3 | Nonsectarian |
| St. Dominic Academy-Auburn | Auburn | PreK-12 | 446 | 12.2 | Roman Catholic |
| Bangor Christian Schools | Bangor | PreK-12 | 324 | 18.9 | Baptist |
| St. Brigid School | Portland | PreK-8 | 323 | 13.5 | Roman Catholic |
| North Yarmouth Academy ✓ | Yarmouth | PreK-12 | 313 | 7.3 | Nonsectarian |
| Maine Coast Waldorf School ✓ | Freeport | PreK-12 | 227 | 6.1 | Nonsectarian |
| Temple Academy | Waterville | PreK-12 | 224 | 14 | Christian (nondenominational) |
| St. Dominic Academy-Lewiston Campus | Lewiston | PreK-5 | 189 | 9.9 | Roman Catholic |
| St. Dominic Academy | Lewiston | PreK-5 | 188 | 10.4 | Roman Catholic |
| Penobscot Christian School | Bangor | PreK-12 | 182 | 9 | Christian (nondenominational) |
| St. Michael School | Augusta | PreK-8 | 153 | 14 | Roman Catholic |
| Greater Portland Christian School | South Portland | PreK-12 | 136 | 7.6 | Christian (nondenominational) |
| St. John's Catholic School | Brunswick | PreK-8 | 134 | 10.3 | Roman Catholic |
| Friends School of Portland | Cumberland Foreside | PreK-8 | 128 | 5.9 | Friends |
| Pine Tree Academy | Freeport | PreK-12 | 123 | 7.7 | Seventh-Day Adventist |
| Seacoast Christian School | South Berwick | PreK-12 | 116 | 5.9 | Christian (nondenominational) |
| St. Thomas Consolidated School | Sanford | PreK-8 | 103 | 10.7 | Roman Catholic |
| Breakwater School | Portland | PreK-8 | 98 | 6.1 | Nonsectarian |
| The Bay School ✓ | Blue Hill | PreK-8 | 95 | 9.9 | Nonsectarian |
| Holy Cross School | South Portland | PreK-8 | 95 | 4.8 | Roman Catholic |
| Central Maine Christian Academy | Lewiston | PreK-11 | 85 | 6.2 | Christian (nondenominational) |
| Damariscotta Montessori School | Nobleboro | PreK-8 | 82 | 13.7 | Nonsectarian |
| Seacoast Waldorf School | Eliot | PreK-8 | 65 | 3.2 | Nonsectarian |
| Kennebec Montessori School | Fairfield | PreK-6 | 62 | 9.1 | Nonsectarian |
| Highview Christian Academy | Charleston | PreK-11 | 54 | 7.3 | Christian (nondenominational) |
| Cornerspring Montessori School | Belfast | PreK-8 | 51 | 9.3 | Nonsectarian |
| Ashwood Waldorf School | Rockport | PreK-8 | 44 | 5.4 | Nonsectarian |
| L'ecole Francaise Du Maine | South Freeport | PreK-4 | 42 | 7.5 | Nonsectarian |
| Bangor Montessori School | Bangor | PreK-6 | 38 | 11.5 | Nonsectarian |
| Brixham Montessori Friends School | York | PreK-3 | 25 | 3.6 | Nonsectarian |
| Kidspeace National Centers of New England | Ellsworth | PreK-11 | 23 | 2.9 | Nonsectarian |
| Children's House Montessori School | Camden | PreK-3 | 20 | 5.6 | Nonsectarian |
| The Glickman Lauder Center of Excellence in Autism | Portland | PreK-12 | 20 | not reported | Nonsectarian |
| The Little Dolphin School Foundation | Westbrook | PreK-1 | 17 | 6.5 | Nonsectarian |
| Winfield Childrens House | Falmouth | PreK-K | 15 | 3.8 | Nonsectarian |
| Pathways Merry Meeting Center | Brunswick | PreK-12 | 14 | 15.6 | Nonsectarian |
| Childrens Ctr-Early Interven and Fam Support | Augusta | PreK-3 | 11 | not reported | Nonsectarian |
| Kidspeace-Millinocket | Millinocket | PreK-12 | 9 | 4.5 | Nonsectarian |
| Pine Grove School | Falmouth | PreK-K | 7 | 2.3 | Nonsectarian |