1840 4,470 94.437 1845 12,088 3 , 065 , 022 1850 28,269 7 , 220 , 249 1855 80,023 26 ; 992 , 893 1860 109,263 37 , 053 , 512 1865 187,446 64 , 709 , 177 1870 297,718 266 , 022 , 180 Chicago hade48,300