Okayama-kōan (岡山県 Okayama-ken?)Ji̍t-pún Honsyû ê chi̍t-ê kōan, siú-hú sī Okayama-chhī.

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岡山県
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 - Lóng-chóng 7,114.50 km2
Jîn-kháu (2018)
 - Lóng-chóng 1,906,464 lâng
 - Bi̍t-tō͘ 268/km2
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