Maine is a state that has never had a significant Amish presence. Maine currently has 3 settlements of one church district each. Bangor Daily News features an article today about a new Maine Amish community (no longer online), recently formed by Amish from Kentucky, Missouri, and a settlement in Smyrna in the northern part of the state.
Interestingly, the deacon of this congregation is cited in the article as saying that his church is open to new congregants, and that they hold part of church services in English when outsiders are present.
And if you’re interested, check out this 2005 Boston Globe article about the Smyrna Amish community, in existence since 1996. Also, read more about all Maine Amish settlements in the Amish State Guide, or view a directory of Amish woodworking in the state: Amish Furniture-Maine.