The following data show the changes in population of Kitakyushu city, from 1920 to 2014. Its population is on a long-term declining trend.
| Year | Households | Population | Men | Women |
| 1920 | 64,522 | 289,460 | 159,163 | 130,297 |
| 1925 | 79,399 | 352,804 | 187,073 | 165,731 |
| 1930 | 103,242 | 473,391 | 248,644 | 224,747 |
| 1935 | 119,855 | 581,757 | 303,569 | 278,188 |
| 1940 | 152,664 | 747,106 | 397,442 | 349,664 |
| 1945 | 114,931 | 505,061 | … | … |
| 1950 | 159,341 | 711,306 | 357,490 | 353,816 |
| 1955 | 190,424 | 868,032 | 431,201 | 436,831 |
| 1960 | 234,488 | 986,401 | 492,897 | 493,504 |
| 1965 | 271,365 | 1,042,388 | 512,078 | 530,310 |
| 1970 | 297,233 | 1,042,321 | 504,928 | 537,393 |
| 1975 | 323,856 | 1,058,058 | 513,149 | 544,909 |
| 1980 | 351,310 | 1,065,078 | 514,167 | 550,911 |
| 1985 | 358,382 | 1,056,402 | 506,618 | 549,784 |
| 1990 | 367,341 | 1,026,455 | 488,120 | 538,335 |
| 1995 | 388,741 | 1,019,598 | 483,936 | 535,662 |
| 2000 | 408,080 | 1,011,471 | 478,605 | 532,866 |
| 2005 | 413,510 | 993,525 | 466,779 | 526,746 |
| 2010 | 420,702 | 976,846 | 459,305 | 517,541 |
| 2014 | 429,123 | 963,259 | 453,035 | 510,224 |
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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