You can start here https://www.wikitree.com/wiki/Category:Maine_Unsourced_Profiles
Or here https://www.wikitree.com/wiki/DBE_UnsourcedList_ME
Or here for more places https://www.wikitree.com/wiki/Space:DBE_Unsourced
Lots of the time you can also find profiles that lack sources but don’t have the unsourced tag if you look here https://www.wikitree.com/wiki/Space:DBE_Errors_By
There is a category: Category:Maine_Unsourced_Profiles
I don't know if there is way to search by location.