Okayama: Population Decline Ranking
All 31 municipalities in Okayama ranked by Population Decline.
Top municipalities in Okayama by population decline: 1. Takahashi (-51.7%), 2. Bizen (-48.8%), 3. Niimi (-47.7%).
| Rank | Municipality | Pop. (2025) | Change 2020–2050 |
|---|---|---|---|
| 1 | Okayama Takahashi | 25,546 | ▼ -51.7% |
| 2 | Okayama Bizen | 28,640 | ▼ -48.8% |
| 3 | Okayama Niimi | 24,861 | ▼ -47.7% |
| 4 | Okayama Kasaoka | 41,221 | ▼ -45.0% |
| 5 | Okayama Misaki | 11,573 | ▼ -44.2% |
| 6 | Okayama Kumenan | 4,041 | ▼ -43.5% |
| 7 | Okayama Tamano | 51,910 | ▼ -43.2% |
| 8 | Okayama Kibichuuou | 9,896 | ▼ -42.8% |
| 9 | Okayama Maniwa | 38,441 | ▼ -42.5% |
| 10 | Okayama Mimasaka | 23,106 | ▼ -42.5% |
| 11 | Okayama Wake | 12,334 | ▼ -38.8% |
| 12 | Okayama Ibara | 35,310 | ▼ -38.6% |
| 13 | Okayama Nagi | 5,088 | ▼ -33.9% |
| 14 | Okayama Shinjou | 714 | ▼ -33.6% |
| 15 | Okayama Yakage | 12,341 | ▼ -33.5% |
| 16 | Okayama Asakuchi | 30,366 | ▼ -33.0% |
| 17 | Okayama Kagamino | 11,121 | ▼ -30.2% |
| 18 | Okayama Tsuyama | 92,543 | ▼ -29.3% |
| 19 | Okayama Setouchi | 34,654 | ▼ -25.9% |
| 20 | Okayama Nishiawakura | 1,244 | ▼ -25.6% |
| 21 | Okayama Higashi | 88,572 | ▼ -21.5% |
| 22 | Okayama Akaiwa | 40,892 | ▼ -19.4% |
| 23 | Okayama Shouou | 10,358 | ▼ -18.5% |
| 24 | Okayama Satoshou | 10,424 | ▼ -16.7% |
| 25 | Okayama Minami | 162,735 | ▼ -14.2% |
| 26 | Okayama Kurashiki | 461,848 | ▼ -13.6% |
| 27 | Okayama Okayama | 707,387 | ▼ -11.2% |
| 28 | Okayama Souja | 68,731 | ▼ -10.8% |
| 29 | Okayama Hayashima | 12,570 | ▼ -10.0% |
| 30 | Okayama Kita | 310,929 | ▼ -8.2% |
| 31 | Okayama Naka | 145,151 | ▼ -7.8% |