Michigan
As in many states, a minor, with parental consent, and often with the requirement that the parent be present, can get a tattoo. However, a story by a tattoo artist in Michigan notes that the artist is not required to perform a tattoo on a minor and therefore, chooses not to do so under any circumstances. Thus, while minors may get tattoos, it is possible that the desired tattoo artist may not choose to give tattoos to minors.
http://theshopssite.com/tag/michigan-tattoo-minors-law-parental-permission/