| Waynflete School ✓ | Portland | PreK-12 | 520 | 6.3 | Nonsectarian |
| St. Dominic Academy-Auburn | Auburn | PreK-12 | 446 | 12.2 | Roman Catholic |
| Foxcroft Academy ✓ | Dover Foxcroft | 8-12 | 445 | 14.4 | Nonsectarian |
| 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) |
| Gould Academy ✓ | Bethel | 8-12 | 214 | 8.2 | Nonsectarian |
| Hebron Academy ✓ | Hebron | 6-12 | 185 | 6.8 | Nonsectarian |
| Penobscot Christian School | Bangor | PreK-12 | 182 | 9 | Christian (nondenominational) |
| St. Michael School | Augusta | PreK-8 | 153 | 14 | Roman Catholic |
| Maine Coast Semester at Chewonki ✓ | Wiscasset | Transitional K-12 | 145 | 6.6 | Nonsectarian |
| 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) |
| Calvary Christian Academy | Turner | K-12 | 108 | 12.1 | Baptist |
| St. Thomas Consolidated School | Sanford | PreK-8 | 103 | 10.7 | Roman Catholic |
| Carrabassett Valley Academy ✓ | Carrabassett Valley | 7-12 | 100 | 8.3 | Nonsectarian |
| 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) |
| Chop Point School | Woolwich | K-12 | 84 | 6.8 | Christian (nondenominational) |
| Damariscotta Montessori School | Nobleboro | PreK-8 | 82 | 13.7 | Nonsectarian |
| Center for Teaching & Learning ✓ | Edgecomb | K-8 | 68 | 9.2 | Nonsectarian |
| Seacoast Waldorf School | Eliot | PreK-8 | 65 | 3.2 | Nonsectarian |
| Lisbon Falls Christian Academy | Lisbon Falls | K-11 | 63 | 6.6 | Baptist |
| Kennebec Montessori School | Fairfield | PreK-6 | 62 | 9.1 | Nonsectarian |
| Highview Christian Academy | Charleston | PreK-11 | 54 | 7.3 | Christian (nondenominational) |
| Royal Academy Education | Gray | K-12 | 54 | 12.3 | Nonsectarian |
| Androscoggin Learning & Transition Center | Auburn | K-12 | 52 | 5.2 | Nonsectarian |
| Cornerspring Montessori School | Belfast | PreK-8 | 51 | 9.3 | Nonsectarian |
| The School at Sweetser | Saco | 3-12 | 50 | 5 | Nonsectarian |
| Levey Day School | Portland | K-8 | 44 | 5.6 | Jewish |
| Mmcfc, Memorial Ave | Lewiston | 5-12 | 44 | 11 | Nonsectarian |
| Ashwood Waldorf School | Rockport | PreK-8 | 44 | 5.4 | Nonsectarian |
| Opportunity Training Center | Presque Isle, | K-12 | 42 | 9.1 | Nonsectarian |