Maine is a state in the northeastern region of the United States of America. It is known to have a wizarding population, as at least one witch resided there in 1994. The local wizarding community is evidently part of international magical commerce, being affected by the import and sale of goods such as cauldrons.
Maine's only mention in the series serves to illustrate the international scope of the work conducted by the Department of International Magical Co-operation at the British Ministry of Magic. In *Harry Potter and the Goblet of Fire*, Percy Weasley, in his capacity as assistant to Barty Crouch Sr., proudly describes his efforts to standardise cauldron bottom thickness. As an example of the problem, he mentions having received a report about a faulty, dangerously thin-bottomed cauldron from a witch in Maine. This single reference highlights the global nature of wizarding trade and the regulatory challenges faced by magical governments.
No specific magical locations within Maine are mentioned in the seven original novels.
While not detailed in the novels, supplementary writings by J.K. Rowling establish a broader context for Magic in North America. Witches and wizards from Maine would fall under the jurisdiction of the Magical Congress of the United States of America (MACUSA) (Pottermore). Additionally, the North American school of magic, Ilvermorny School of Witchcraft and Wizardry, is located in the neighboring state of Massachusetts on Mount Greylock and would be the primary educational institution for young magical individuals from Maine (Pottermore).