The following data show the changes in population of Okayama city, from 1920 to 2014.
| Year | Households | Population | Men | Women |
| 1920 | 21,423 | 94,585 | 45,779 | 48,806 |
| 1925 | 28,005 | 124,521 | 61,267 | 63,254 |
| 1930 | 33,083 | 139,222 | 69,290 | 69,932 |
| 1935 | 35,837 | 166,144 | 81,594 | 84,550 |
| 1940 | 36,496 | 163,552 | 77,381 | 86,171 |
| 1945 | 22,213 | 92,862 | 45,165 | 47,697 |
| 1950 | 38,958 | 162,904 | 78,400 | 84,504 |
| 1955 | 54,710 | 235,754 | 113,306 | 122,448 |
| 1960 | 65,949 | 260,773 | 124,681 | 136,092 |
| 1965 | 81,016 | 291,825 | 139,348 | 152,477 |
| 1970 | 111,265 | 375,106 | 180,456 | 194,650 |
| 1975 | 156,933 | 513,471 | 248,453 | 265,018 |
| 1980 | 178,929 | 545,765 | 264,648 | 281,117 |
| 1985 | 191,318 | 572,479 | 277,727 | 294,752 |
| 1990 | 207,731 | 593,730 | 287,368 | 306,362 |
| 1995 | 231,678 | 615,757 | 298,231 | 317,526 |
| 2000 | 244,010 | 626,642 | 302,339 | 324,303 |
| 2005 | 275,242 | 674,746 | 324,623 | 350,123 |
| 2010 | 296,790 | 709,584 | 341,158 | 368,426 |
| 2014 | … | 714,583 | 343,674 | 370,909 |
Source is City of Yokohama. 大都市比較統計年表 I 土地及び気象 ～ V 工業 [H26 ～]
www.city.yokohama.lg.jp/ex/stat/daitoshi/
www.city.yokohama.lg.jp/ex/stat/daitoshi/h26/data/h020100.xlsx
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