year rank population 1840 70 6048 1850 37 17882 1860 49 18554 1870 42 31274 1880 33 51647 1890 30 88150 1900 28 125560 1910 29 181511 1920 28 237031 1930 28 290564 1940 26 306087 1950 28 375901 1960 28 471316 1970 21 539677 1980 19 564871 1990 16 632910