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| Owner Members | Associate Members | Contract Members |
| North Yarmouth | Baldwin | Andover |
| Bridgton | Hiram | Appleton |
| Cape Elizabeth | Naples | Augusta |
| Casco | Parsonsfield | Brownfield |
| Cumberland | Porter | Camden |
| Falmouth | Saco | Chebeague Island |
| Freeport | Standish | Chelsea |
| Gorham | | Cornish |
| Gray | | Eliot |
| Harrison | | Fayette |
| Hollis | | Frye Island |
| Lyman | | Fryeburg |
| Limington | | Greenland (NH) |
| Portland | | Hope |
| Pownal | | Kittery |
| Scarborough | | Lamoine |
| South Portland | | Liberty |
| Waterboro | | Limerick |
| Windham | | Lincolnville |
| Yarmouth | | Livermore Falls |
| | Monmouth |
| | Newington (NH) |
| | North Haven |
| | Old Orchard Beach |
| | Otisfield |
| | Owl's Head |
| | Readfield |
| | Rockland |
| | Rockport |
| | Sanford |
| | Shapleigh |
| | Somerville |
| | South Thomaston |
| | Thomaston |
| | Union |
| | Vinalhaven |
| | Washington |
| | Waterville |
| | Wayne |
| | Westbrook |
| | Woolwich |
