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

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Missouri was 6,015,300 and represented 97.95% of the total Missouri population.

Among all Missouri counties, St. Louis had the highest citizen population (968.66K), followed by Jackson (688.76K), and St. Charles (394.94K).

In terms of percentages, Carter had the highest percentage of its population being citizens (100.00%), followed by Hickory (100.00%), and Reynolds (100.00%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

You may also be interested in:
Missouri Citizen Voting-age Population By County in 2021

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Missouri Citizen Population By County in 2021

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County	Citizen Population	% of County Population
St. Louis	968655	96.67
Jackson	688760	96.57
St. Charles	394940	98.15
Greene	292235	98.44
St. Louis city	291655	96.32
Clay	245125	98.00
Jefferson	224555	99.40
Boone	175030	96.08
Jasper	118800	97.33
Cass	106385	99.46
Franklin	103505	99.21
Platte	103085	98.00
Christian	86530	98.53
Buchanan	83840	98.01
Cape Girardeau	79765	98.37
Cole	76545	98.88
St. Francois	66640	99.21
Lincoln	58560	99.78
Newton	57465	98.01
Taney	55420	99.22
Johnson	53115	98.56
Pulaski	52395	98.01
Callaway	44235	99.52
Phelps	43280	96.85
Camden	42590	98.92
Butler	42180	99.68
Pettis	41065	95.68
Howell	39490	99.33
Webster	38740	99.38
Scott	37950	99.45
Lawrence	37395	98.09
Laclede	35645	99.29
Warren	34985	99.86
Barry	33925	97.91
Lafayette	32575	99.47
Polk	31425	99.64
Stone	30825	99.37
Stoddard	28765	99.84
Marion	28435	99.55
Dunklin	27900	97.59
Audrain	24920	98.79
Texas	24810	99.78
Randolph	24765	99.54
Adair	24480	96.61
Miller	24470	99.29
Washington	23725	99.73
Crawford	23140	99.72
Ray	22945	99.42
Saline	22670	97.38
Henry	21820	99.70
McDonald	21530	92.54
Nodaway	21400	99.21
Clinton	20970	99.41
Morgan	20835	99.76
Vernon	19725	99.47
Benton	19260	99.54
Perry	18750	98.66
Ste. Genevieve	18350	99.70
Wright	18220	99.86
Pike	17975	99.58
Andrew	17950	99.58
Cooper	17360	99.80
Dallas	16780	99.03
New Madrid	16570	99.46
Bates	16080	99.88
Pemiscot	15905	99.72
Moniteau	15585	99.11
Macon	15105	99.24
Livingston	14885	99.23
Gasconade	14765	99.73
Dent	14480	99.28
Cedar	14125	99.58
Osage	13365	99.96
Mississippi	12890	99.35
Madison	12570	99.80
Linn	11925	99.71
Douglas	11780	99.75
Barton	11685	99.79
DeKalb	11540	99.14
Montgomery	11325	99.47
Wayne	11290	99.91
Ripley	11030	100.00
Bollinger	10750	99.91
Ralls	10310	99.90
Howard	10105	99.61
Lewis	9965	99.35
Grundy	9815	99.14
Iron	9570	99.64
St. Clair	9180	99.40
Oregon	8870	99.78
Caldwell	8810	99.49
Ozark	8650	99.83
Monroe	8580	99.25
Carroll	8525	99.53
Hickory	8430	100.00
Daviess	8395	99.64
Maries	8380	99.11
Harrison	8160	99.15
Dade	7560	99.67
Chariton	7385	99.39
Shannon	7170	99.79
Clark	6630	99.70
Gentry	6160	98.88
Reynolds	6140	100.00
Shelby	6075	99.84
Sullivan	5810	96.11
Carter	5365	100.00
Atchison	5305	99.91
Scotland	4725	99.27
Putnam	4705	99.79
Holt	4285	99.77
Schuyler	4090	99.88
Knox	3740	98.94
Mercer	3500	98.32
Worth	2005	100.00