Missouri 2020 Census Total Voting-age Population (18yrs and over) By County

According to the data from the US 2020 decennial Census, as at April 2020, the total Voting-age population (18 years and over) of Missouri was 4,775,612, which was 77.59% of the total Missouri population.

St. Louis County had the highest voting-age population (784,377), followed by Jackson County (554,167), and then St. Charles County (310,617). On the other hand, the 3 counties with low voting-age population were: Worth County (1,565), Mercer County (2,727), and Knox County (2,838).

You can also see this information for other states and also for the US by state.

Hover over or click on the counties to see the number and percentage of Missouri population that lives in each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can also see the voting-age population by county for the different racial groups as well as the different ethnicities in Missouri.