The following data show the changes in population of Niigata city, from 1920 to 2014. Its population jumped up by mergers with nearby municipalities in 2005.
| Year | Households | Population | Men | Women |
| 1920 | 18,965 | 92,130 | 45,435 | 46,695 |
| 1925 | 22,077 | 108,941 | 53,724 | 55,217 |
| 1930 | 24,481 | 125,108 | 61,760 | 63,348 |
| 1935 | 26,319 | 134,992 | 66,370 | 68,622 |
| 1940 | 29,241 | 150,903 | 74,689 | 76,214 |
| 1945 | 36,032 | 174,170 | 81,916 | 92,254 |
| 1950 | 45,631 | 220,901 | 107,781 | 113,120 |
| 1955 | 53,234 | 261,758 | 128,396 | 133,362 |
| 1960 | 70,009 | 314,528 | 153,659 | 160,869 |
| 1965 | 87,439 | 356,302 | 174,235 | 182,067 |
| 1970 | 103,973 | 383,919 | 186,246 | 197,673 |
| 1975 | 124,834 | 423,188 | 206,411 | 216,777 |
| 1980 | 145,606 | 457,785 | 224,523 | 233,262 |
| 1985 | 155,113 | 475,630 | 231,997 | 243,633 |
| 1990 | 166,789 | 486,097 | 235,765 | 250,332 |
| 1995 | 182,534 | 494,769 | 240,403 | 254,366 |
| 2000 | 195,119 | 501,431 | 243,552 | 257,879 |
| 2005 | 291,524 | 785,134 | 378,725 | 406,409 |
| 2010 | 312,533 | 811,901 | 390,406 | 421,495 |
| 2014 | 327,319 | 808,143 | 388,236 | 419,907 |
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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