South Dakota Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for South Dakota was 845,335 and represented 97.81% of the total South Dakota population.

Among all South Dakota counties, Minnehaha had the highest citizen population (178.38K), followed by Pennington (107.93K), and Lincoln (54.23K).

In terms of percentages, Buffalo had the highest percentage of its population being citizens (100.00%), followed by Faulk (100.00%), and Gregory (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:
South Dakota Citizen Voting-age Population By County in 2018

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

See this for other years:

South Dakota Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Minnehaha	178375	95.52
Pennington	107930	98.75
Lincoln	54225	98.74
Brown	37900	97.58
Brookings	32540	95.04
Codington	27745	99.11
Meade	27210	99.22
Lawrence	24820	98.36
Yankton	22550	99.27
Davison	19760	99.30
Hughes	17460	99.12
Beadle	16520	89.91
Union	14915	98.29
Oglala Lakota	14315	99.86
Clay	13610	97.74
Lake	12465	99.13
Roberts	10200	99.17
Butte	10140	99.66
Todd	9985	98.42
Charles Mix	9340	99.95
Custer	8455	98.60
Turner	8215	99.40
Hutchinson	7275	99.45
Grant	7045	97.64
Bon Homme	6920	99.28
Fall River	6715	99.11
Spink	6530	99.77
Moody	6420	98.69
Hamlin	5870	97.83
Dewey	5770	99.83
Day	5490	99.73
McCook	5445	98.82
Tripp	5430	99.27
Walworth	5360	97.28
Brule	5220	99.33
Kingsbury	4955	99.80
Marshall	4690	95.81
Deuel	4260	98.96
Gregory	4200	100.00
Corson	4165	99.88
Edmunds	3900	98.99
Lyman	3870	100.00
Clark	3660	99.59
Bennett	3425	99.71
Hanson	3395	100.00
Hand	3300	100.00
Jackson	3280	99.85
Stanley	2995	100.00
Perkins	2895	99.66
Douglas	2885	98.46
Ziebach	2800	99.47
Aurora	2655	96.20
Sanborn	2375	99.37
McPherson	2365	100.00
Faulk	2320	100.00
Potter	2300	98.93
Miner	2205	98.88
Haakon	2080	100.00
Buffalo	2055	100.00
Mellette	2055	100.00
Jerauld	1985	97.78
Campbell	1430	99.65
Sully	1330	100.00
Hyde	1325	99.62
Harding	1285	98.09
Jones	730	99.32