Non-municipality
The same kanji which designates a town (町) is also sometimes used for addresses of sections of an urban area. In rare cases, a municipal village might even contain a section with the same type of designation. Although the kanji is the same, neither of these individual sections are municipalities unto themselves. Sometimes, the section name is a remnant from gappei, a system where several adjacent communities merge to form a larger municipality, where the old town names are kept for a section of the new city, even though the resulting new city may have a completely different name.
Subprefectures are branch offices of the prefectures and not municipalities by themselves.
Districts are not current municipalities but names of groups of towns and villages.
Provinces are not current municipalities but (almost obsolete) names of geographical regions similar to prefectures.
Read more about this topic: Municipalities Of Japan