Missouri Voting-age Population By County in 2021 (ACS-5Yrs)

Updated on February 28, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Missouri was 4.75M which was 77.33% of the total Missouri population. Among all Missouri counties, St. Louis had the highest voting-age population (779.13K), followed by Jackson (544.43K), and St. Charles (308.62K).

On the other hand, the counties with the least voting-age population were: Worth (1.60K), Mercer (2.71K), and Knox (2.88K).

The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.

You can see similar information for other states and by state for the United States.

Related Topics: Missouri ACS-5Yrs Estimates, 2021 Topic List.

Data Source: US Census - ACS 5-Year Estimates, 2021 Census.

Missouri Voting-age Population By County in 2021

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County	Voting-age Population	% of County Population
Adair	20701	81.70
Andrew	13807	76.61
Atchison	4205	79.16
Audrain	19419	76.99
Barry	26732	77.15
Barton	8922	76.18
Bates	12237	76.01
Benton	15995	82.66
Bollinger	8421	78.28
Boone	144698	79.43
Buchanan	66165	77.35
Butler	32280	76.29
Caldwell	6722	75.90
Callaway	34976	78.69
Camden	35305	82.00
Cape Girardeau	63521	78.34
Carroll	6627	77.38
Carter	4207	78.42
Cass	81163	75.88
Cedar	10743	75.74
Chariton	5731	77.11
Christian	65420	74.49
Clark	4994	75.11
Clay	189674	75.83
Clinton	16115	76.39
Cole	60065	77.59
Cooper	13530	77.77
Crawford	17932	77.28
Dade	6009	79.23
Dallas	12799	75.53
Daviess	6259	74.27
DeKalb	9469	81.36
Dent	11250	77.13
Douglas	9184	77.78
Dunklin	21129	73.90
Franklin	80314	76.98
Gasconade	11720	79.17
Gentry	4695	75.35
Greene	234658	79.04
Grundy	7430	75.04
Harrison	6208	75.44
Henry	17075	78.03
Hickory	6957	82.54
Holt	3408	79.35
Howard	7901	77.86
Howell	30123	75.78
Iron	7539	78.48
Jackson	544428	76.33
Jasper	91465	74.94
Jefferson	173494	76.80
Johnson	42238	78.38
Knox	2881	76.18
Laclede	26897	74.93
Lafayette	25092	76.61
Lawrence	28304	74.24
Lewis	7798	77.74
Lincoln	43641	74.36
Linn	9104	76.11
Livingston	11751	78.33
McDonald	17385	74.72
Macon	11641	76.47
Madison	9625	76.41
Maries	6719	79.45
Marion	21784	76.26
Mercer	2711	76.13
Miller	18782	76.22
Mississippi	10186	78.50
Moniteau	11792	75.00
Monroe	6704	77.57
Montgomery	8844	77.69
Morgan	16009	76.66
New Madrid	12736	76.46
Newton	44579	76.03
Nodaway	18117	83.99
Oregon	6792	76.39
Osage	10317	77.15
Ozark	6984	80.61
Pemiscot	11784	73.89
Perry	14526	76.42
Pettis	32136	74.88
Phelps	35191	78.74
Pike	13918	77.10
Platte	80177	76.22
Polk	24216	76.78
Pulaski	41699	78.00
Putnam	3620	76.78
Ralls	8098	78.48
Randolph	19455	78.19
Ray	17813	77.18
Reynolds	4985	81.22
Ripley	8410	76.23
St. Charles	308623	76.70
St. Clair	7345	79.53
Ste. Genevieve	14437	78.44
St. Francois	52868	78.71
St. Louis	779134	77.76
Saline	17901	76.90
Schuyler	3029	73.99
Scotland	3371	70.82
Scott	28920	75.78
Shannon	5605	78.01
Shelby	4596	75.51
Stoddard	22422	77.82
Stone	25855	83.36
Sullivan	4618	76.39
Taney	43983	78.75
Texas	19558	78.65
Vernon	14964	75.46
Warren	26775	76.43
Washington	18213	76.55
Wayne	8960	79.31
Webster	28338	72.70
Worth	1599	79.79
Wright	13483	73.90
St. Louis city	245300	81.01