Population history of Chicago from 1840 - 1990

year	rank	population

1840  	  92  	      4470
1850  	  24  	     29963
1860  	   9  	    112172
1870  	   5  	    298977
1880  	   4  	    503185
1890  	   2  	   1099850
1900  	   2  	   1698575
1910  	   2  	   2185283
1920  	   2  	   2701705
1930  	   2  	   3376438 
1940  	   2  	   3396808 
1950  	   2  	   3620962 
1960  	   2  	   3550404 
1970  	   2  	   3366957 
1980  	   2  	   3005072 
1990  	   3  	   2783726