Does Kyushu Have a Capital City?

Kyushu, Japan's third-largest island, has no official capital. It is an island, not a prefecture or country. However:

• Fukuoka City (pop. ~1.6M metro) is the largest city, economic hub, and transport gateway (Hakata Station, Fukuoka Airport).
• Prefectural capitals on Kyushu: Fukuoka (Fukuoka Pref.), Saga, Nagasaki, Kumamoto, Oita, Miyazaki, Kagoshima.

Fukuoka functions as the de facto regional center for business, culture, and government coordination.