Population of St. Louis City & County, and Missouri 1820-2020

The tables below give the population of the city of St. Louis, St. Louis County, and the state of Missouri every ten years from 1820-2010. The population figures are from the U.S. Federal Census.

Year	St. Louis	Missouri
1820	10,049	66,586
1830	14,125	140,455
1840	35,979	383,702
1850	104,978	682,044
1860	190,524	1,182,012
1870	351,189	1,721,295

St. Louis City and County separated from each other on 22 August 1876.

Year	St. Louis City	St. Louis County	Missouri
1880	350,518	31,888	2,168,380
1890	451,770	36,307	2,679,184
1900	575,238	50,040	3,106,665
1910	687,029	82,417	3,293,335
1920	772,897	100,737	3,404,055
1930	821,960	211,593	3,629,367
1940	816,048	274,230	3,784,664
1950	856,796	406,349	3,954,653
1960	750,026	703,532	4,319,813
1970	622,236	951,353	4,676,501
1980	453,085	973,896	4,916,686
1990	396,685	993,529	5,117,073
2000	348,189	1,016,315	5,595,211
2010	319,294	998,954	5,988,927
2020	301,578	1,004,125	6,154,913

Sources...
U.S. Bureau of the Census QuickFacts
U.S. Bureau of the Census: U.S. Population of States and Counties: 1790-1990, Missouri Section
U.S. Bureau of the Census: Historical Population Change Data (1910-2020)

Related Resources...
St. Louis, Missouri Genealogy Resources

Some Free Online U.S. Census Records and Indexes, 1790-1950

U.S. Census Records, 1790-1950 a research guide with links to online indexes

How Much Does it Cost to Take the U.S. Census?

Population of St. Louis City and County, and Missouri 1820-2020

Saint Louis Population Figures from the U.S. Census Bureau