Prefecture
The population development of Okayama Prefecture according to census results.
| Name | Abbr. | Status | Native | Capital | Area A-L (km²) | Population Census (Cf) 1995-10-01 | Population Census (Cf) 2000-10-01 | Population Census (Cf) 2005-10-01 | Population Census (Cf) 2010-10-01 | Population Census (Cf) 2015-10-01 | Population Census (Cf) 2020-10-01 | Population Census (Cp) 2025-10-01 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Okayama | 33 | Pref | 岡山県 | Okayama | 7,114 | 1,950,750 | 1,950,828 | 1,957,264 | 1,945,276 | 1,921,525 | 1,888,432 | 1,808,664 | 711400 | → |
| Japan | JPN | 日本国 | Tōkyō | 377,980 | 125,570,246 | 126,925,843 | 127,767,994 | 128,057,352 | 127,094,745 | 126,146,099 | 123,049,524 | → |
- Statistics Bureau Japan.
Major Cities
| Name | Population Census (Cp) 2025-10-01 | |
|---|---|---|
| 1 | Okayama | 707,916 |
| 2 | Kurashiki | 462,135 |
| 3 | Tsuyama | 92,611 |
| 4 | Sōja | 68,722 |
| 5 | Tamano | 51,975 |
| 6 | Kasaoka | 41,404 |
| 7 | Akaiwa | 40,948 |
| 8 | Maniwa | 38,482 |
| 9 | Ibara | 35,338 |
| 10 | Setouchi | 34,668 |
Contents: Cities & Towns
The population of all cities and towns of Okayama Prefecture with more than 20,000 inhabitants according to census results.
| Name | Status | Native | Population Census (Cf) 1995-10-01 | Population Census (Cf) 2000-10-01 | Population Census (Cf) 2005-10-01 | Population Census (Cf) 2010-10-01 | Population Census (Cf) 2015-10-01 | Population Census (Cf) 2020-10-01 | Population Census (Cp) 2025-10-01 | Area | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Akaiwa (Sanyō) | City | 赤磐市 | 43,011 | 43,813 | 43,913 | 43,458 | 43,214 | 42,661 | 40,948 | 20936 | → |
| Asakuchi (Kamogata) | City | 浅口市 | 38,595 | 37,724 | 37,327 | 36,114 | 34,235 | 32,772 | 30,298 | 6646 | → |
| Bizen | City | 備前市 | 44,855 | 42,534 | 40,241 | 37,839 | 35,179 | 32,320 | 28,619 | 25813 | → |
| Ibara | City | 井原市 | 47,647 | 46,489 | 45,104 | 43,927 | 41,390 | 38,384 | 35,338 | 24354 | → |
| Kasaoka | City | 笠岡市 | 60,478 | 59,300 | 57,272 | 54,225 | 50,568 | 46,088 | 41,404 | 13607 | → |
| Kurashiki | City | 倉敷市 | 453,618 | 460,869 | 469,377 | 475,513 | 477,118 | 474,592 | 462,135 | 35607 | → |
| Maniwa (Ochiai) | City | 真庭市 | 56,607 | 54,747 | 51,782 | 48,964 | 46,124 | 42,725 | 38,482 | 82853 | → |
| Mimasaka | City | 美作市 | 36,140 | 34,577 | 32,479 | 30,498 | 27,977 | 25,939 | 23,181 | 42929 | → |
| Niimi | City | 新見市 | 39,891 | 38,492 | 36,073 | 33,870 | 30,658 | 28,079 | 24,900 | 79329 | → |
| Okayama | City | 岡山市 | 663,346 | 674,375 | 696,172 | 709,584 | 719,474 | 724,691 | 707,916 | 78995 | → |
| Setouchi (Oku) | City | 瀬戸内市 | 39,228 | 39,403 | 39,081 | 37,852 | 36,975 | 36,048 | 34,668 | 12546 | → |
| Sōja | City | 総社市 | 65,437 | 66,201 | 66,584 | 66,201 | 66,855 | 69,030 | 68,722 | 21190 | → |
| Takahashi | City | 高梁市 | 43,115 | 41,077 | 38,799 | 34,963 | 32,075 | 29,072 | 25,600 | 54699 | → |
| Tamano | City | 玉野市 | 71,330 | 69,567 | 67,047 | 64,588 | 60,736 | 56,531 | 51,975 | 10344 | → |
| Tsuyama | City | 津山市 | 113,617 | 111,499 | 110,569 | 106,788 | 103,746 | 99,937 | 92,611 | 50633 | → |
- Statistics Bureau Japan.
Population Structure
Further information about the population structure.
| Gender (C 2025) | |
|---|---|
| Males | 868,734 |
| Females | 939,930 |
| Age Groups (C 2020) | |
|---|---|
| 0-17 years | 281,305 |
| 18-64 years | 980,441 |
| 65+ years | 557,991 |
| Age Distribution (C 2020) | |
|---|---|
| 90+ years | 43,192 |
| 80-89 years | 143,766 |
| 70-79 years | 251,096 |
| 60-69 years | 228,828 |
| 50-59 years | 218,862 |
| 40-49 years | 252,134 |
| 30-39 years | 192,053 |
| 20-29 years | 172,023 |
| 10-19 years | 170,509 |
| 0-9 years | 147,274 |
| Citizenship (C 2020) | |
|---|---|
| Japan | 1,810,900 |
| Foreign Citizenship | 25,116 |