The basic pattern of the Japanese flag--a symbol in a monochrome field--is also used for (afaict) all first & second order subdivision flagspic.twitter.com/jD2P7Se9yd
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Flag of Chiyoda Ward, Tokyo, where the Imperial Palace ispic.twitter.com/S0qkEwUyC7
Some flags have text...these are for Koto and Toshima Wards in Tokyopic.twitter.com/TG4Ja1bJZU
Lots of bird imagery...Fussa, Higashimurayama, Kodaira, Mitaka (cities etc in Tokyo)pic.twitter.com/iFwMl0nUTO
Akiruno looks straight out of a marketing campaignpic.twitter.com/18shVbHznB
This sounds like a nice little project: how many 市町村 (what about 郡 — still used?)?
I'm pretty sure 郡 is only used for Tokyo...but yes, it's still used.
The fun way to do this project is to collect every flag then do a file count when you're done :D
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