For Retail Licenses
3 - Auburn - Bangor - Bowdoinham - Brunswick - Etna (*retail not allowed) - Eustis - Farmington - Hallowell - Mercer (*only manufacturing allowed) - Paris - Poland - South Portland - Topsham (*retail not allowed) - Waterville
Here you may click on link to read ordinances for each town/city.....whether they have or have not opted in.....
Sanford, ME - https://ecode360.com/32669267
Berwick, ME (In contents, see Medical Marijuana) - https://www.berwickmaine.org/document_center/Berwick_Land_Use_Ordinance_11.6.18_Update.pdf
South Portland, ME - https://www.southportland.org/departments/planning-and-development/marijuana-zoning/