1. state (of the US, Australia, India, Germany, etc.); province (e.g. of Canada); county (e.g. of the UK); region (e.g. of Italy); canton; oblast
それぞれの州にも旗がありますね。Each state also has a flag, doesn't it?
2. continent
3. province (of Japan)
4. province (of ancient China); prefecture; department