| # | Institution | Type | Metro | Assets | Efficiency ratio |
|---|---|---|---|---|---|
| 1 | Auburn Savings Bank, FSB Auburn, ME | Bank | Lewiston-Auburn, ME | $103.2M | 92.95% |
| 2 | Great Falls Regional Federal Credit Union Lewiston, ME | Credit Union | — | $65.8M | 92.59% |
| 3 | Saco & Biddeford Savings Institution Saco, ME | Bank | Portland-South Portland, ME | $1.47B | 90.27% |
| 4 | Eastmill Federal Credit Union East Millinocke, ME | Credit Union | — | $78.6M | 89.98% |
| 5 | Midcoast Federal Credit Union Freeport, ME | Credit Union | — | $266.9M | 89.60% |
| 6 | Norstate Federal Credit Union Madawaska, ME | Credit Union | — | $280.4M | 89.34% |
| 7 | Atlantic Regional Federal Credit Union South Portland, ME | Credit Union | — | $1.08B | 88.72% |
| 8 | Downeast Credit Union |
| Credit Union |
| — |
| $327.7M |
| 88.65% |
| 9 | New Dimensions Federal Credit Union Waterville, ME | Credit Union | — | $241.4M | 87.96% |
| 10 | Rockland Savings Bank, FSB Rockland, ME | Bank | — | $90.8M | 87.88% |
| 11 | Milestones Federal Credit Union Lewiston, ME | Credit Union | — | $34.7M | 87.76% |
| 12 | Acadia Federal Credit Union Fort Kent, ME | Credit Union | — | $408.1M | 86.82% |
| 13 | University Credit Union Orono, ME | Credit Union | — | $529.6M | 86.23% |
| 14 | The County Federal Credit Union Presque Isle, ME | Credit Union | — | $520.3M | 85.13% |
| 15 | Casco Federal Credit Union Gorham, ME | Credit Union | — | $121.4M | 84.92% |
| 16 | First Federal Savings and Loan Association of Bath Bath, ME | Bank | Portland-South Portland, ME | $189.1M | 84.62% |
| 17 | Bar Harbor Savings and Loan Association Bar Harbor, ME | Bank | — | $103.2M | 84.17% |
| 18 | Bangor Savings Bank Bangor, ME | Bank | Bangor, ME | $7.74B | 83.03% |
| 19 | Maine Savings Federal Credit Union Hampden, ME | Credit Union | — | $852.0M | 82.41% |
| 20 | Brewer Federal Credit Union Brewer, ME | Credit Union | — | $117.1M | 81.57% |
| 21 | Sabattus Regional Credit Union Sabattus, ME | Credit Union | — | $85.8M | 81.18% |
| 22 | Seaboard Federal Credit Union Bucksport, ME | Credit Union | — | $242.9M | 81.05% |
| 23 | Ancorum Credit Union Bath, ME | Credit Union | — | $405.7M | 80.18% |
| 24 | Winthrop Area Federal Credit Union Winthrop, ME | Credit Union | — | $105.1M | 79.78% |
| 25 | Maine Family Federal Credit Union Lewiston, ME | Credit Union | — | $285.7M | 79.77% |
| 26 | Community Credit Union Lewiston, ME | Credit Union | — | $120.7M | 78.23% |
| 27 | Central Maine Federal Credit Union Lewiston, ME | Credit Union | — | $143.1M | 78.09% |
| 28 | Saco Valley Credit Union Saco, ME | Credit Union | — | $196.0M | 77.68% |
| 29 | Connected Credit Union Augusta, ME | Credit Union | — | $133.6M | 77.33% |
| 30 | Lisbon Community Federal Credit Union Lisbon, ME | Credit Union | — | $211.2M | 76.68% |
| 31 | Maine Highlands Federal Credit Union Dexter, ME | Credit Union | — | $226.6M | 76.32% |
| 32 | Peopleschoice Credit Union Biddeford, ME | Credit Union | — | $366.9M | 75.87% |
| 33 | Katahdin Federal Credit Union Millinocket, ME | Credit Union | — | $109.7M | 75.47% |
| 34 | Partners Bank of New England Sanford, ME | Bank | Portland-South Portland, ME | $1.09B | 75.22% |
| 35 | Androscoggin Savings Bank Lewiston, ME | Bank | Lewiston-Auburn, ME | $1.76B | 73.92% |
| 36 | Skowhegan Savings Bank Skowhegan, ME | Bank | — | $855.0M | 73.91% |
| 37 | Kennebec Savings Bank Augusta, ME | Bank | Augusta-Waterville, ME | $1.87B | 71.40% |
| 38 | Capital Area Federal Credit Union Augusta, ME | Credit Union | — | $71.7M | 70.48% |
| 39 | Aroostook County Federal Savings and Loan Association Caribou, ME | Bank | — | $214.0M | 70.14% |
| 40 | Franklin-Somerset Federal Credit Union Madison, ME | Credit Union | — | $151.8M | 69.63% |
| 41 | K V Federal Credit Union Augusta, ME | Credit Union | — | $138.4M | 69.05% |
| 42 | Franklin Savings Bank Farmington, ME | Bank | — | $786.9M | 69.01% |
| 43 | Kennebunk Savings Bank Kennebunk, ME | Bank | Portland-South Portland, ME | $2.17B | 68.64% |
| 44 | Katahdin Trust Company Patten, ME | Bank | Bangor, ME | $1.16B | 68.38% |
| 45 | Norway Savings Bank Norway, ME | Bank | — | $2.16B | 67.44% |
| 46 | Cumberland County Federal Credit Union Falmouth, ME | Credit Union | — | $488.5M | 67.02% |
| 47 | Machias Savings Bank Machias, ME | Bank | — | $2.67B | 66.99% |
| 48 | Bath Savings Institution Bath, ME | Bank | Portland-South Portland, ME | $1.50B | 66.31% |
| 49 | Oxford Federal Credit Union Mexico, ME | Credit Union | — | $370.2M | 66.19% |
| 50 | Maine Community Bank Portland, ME | Bank | Portland-South Portland, ME | $2.98B | 62.61% |