The Rust Belt took a pretty hard hit in the mid-20th century. Here's how the population of some of the bigger Rust Belt cities, as well as two cities which took perhaps the hardest hits: Gary, IN and Youngstown, OH.
Data for Gary, IN unavailable prior to 1910
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X Axis Detroit Pittsburgh Cleveland Buffalo Akron Cincinnati Youngstown Gary
2020 639111 302971 372624 278349 190469 309317 60068 69093 2010 713777 305704 396815 261310 199110 296945 66982 80294 2000 951270 334563 478403 292648 217074 331285 82026 102746 1990 1027974 369879 505616 328123 223019 364040 95787 116646 1980 1203368 423938 573822 357870 237177 385460 115427 151968 1970 1514063 520117 750903 462768 275425 452525 139788 175415 1960 1670144 604332 876050 532759 290351 502550 166689 178320 1950 1849568 676806 914808 580132 274605 503998 168330 133911 1940 1623452 671659 878336 575901 244791 455610 167720 111719 1930 1568662 669817 900429 573076 255040 451160 170002 100666 1920 993678 588343 796841 506775 208435 401247 132358 55378 1910 465766 533905 560663 423715 69067 363591 79066 16802 1900 285704 321616 381768 352387 42728 325902 44885 1890 205876 238617 261353 255664 27601 296908 33220 1880 116340 156389 160146 155134 16512 255139 15435 1870 79577 86076 92829 117714 10006 216239 8075 1860 45619 49221 43417 81129 3477 161044 2759