| Aroostook Hills Subsection |
| Aroostook Lowlands Subsection |
| Casco Bay Coast Subsection |
| Central Maine Embayment Subsection |
| Central Maine Foothills Subsection |
| Connecticut Lakes Subsection |
| Gulf of Maine Coastal Lowland Subsection |
| Gulf of Maine Coastal Plain Subsection |
| International Boundary Plateau Subsection |
| Mahoosuc Rangely Lakes |
| Maine Central Mountains Subsection |
| Maine Eastern Coastal Subsection |
| Maine Eastern Interior Subsection |
| Maine-New Brunswick Lowlands Subsection |
| Penobscott Bay Coast Subsection |
| Sebago -Ossipee Hills and Plain Subsection |
| St. John Upland Subsection |
| Western Maine Foothills Subsection |
| White Mountain Subsection |