Okayama-ken is a prefecture of Japan.
Boundaries: Natural Earth (naturalearthdata.com), public domain
| Aida-gun | no seat recorded | 1 subdistrict |
| Akaiwa Shi | Akaiwa | 45 k |
| Asakuchi-gun | no seat recorded | 1 subdistrict |
| Asakuchi Shi | Asakuchi | 36 k |
| Bizen Shi | Bizen | 38 k |
| Futakawa-son | no seat recorded | |
| Ibara Shi | Ibara | 43 k |
| Kaga-gun | no seat recorded | 1 subdistrict |
| Kasaoka Shi | Kasaoka | 53 k |
| Katsuta-gun | no seat recorded | 2 subdistricts |
| Kume-gun | no seat recorded | 2 subdistricts |
| Kurashiki Shi | Kurashiki | 483 k |
| Maniwa-gun | no seat recorded | 1 subdistrict |
| Maniwa Shi | Maniwa | 49 k |
| Mimasaka-shi | Mimasaka | 30 k |
| Niimi Shi | Niimi | 33 k |
| Oda-gun | no seat recorded | 1 subdistrict |
| Okayama Shi | Okayama | 4 subdistricts |
| Setouchi Shi | Setouchi | 39 k |
| Sōja Shi | Sōja | 68 k |
| Takahashi Shi | Takahashi | 34 k |
| Tamano Shi | Tamano | 64 k |
| Tomata-gun | no seat recorded | 1 subdistrict |
| Tsukubo-gun | no seat recorded | 1 subdistrict |
| Tsuyama Shi | Tsuyama | 106 k |
| Wake-gun | no seat recorded | 1 subdistrict |
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