County Formation

County	2000 Population	Square Miles	County Seat	Founded
Aurora	3,058	708	Plankinton	1881
Beadle	17,023	1,259	Huron	1879
Bennett	3,574	1,185	Martin	1909
Bon Homme	7,260	563	Tyndall	1862
Brookings	28,220	794	Brookings	1892
Brown	35,460	1,713	Aberdeen	1879
Brule	5,364	819	Chamberlain	1875
Buffalo	2,032	471	Gann Valley	1873
Butte	9,094	2,249	Belle Fourche	1883
Campbell	1,782	736	Mound City	1873
Charles Mix	9,350	1,098	Lake Andes	1862
Clark	4,143	958	Clark	1873
Clay	13,537	412	Vermillion	1862
Codington	25,897	688	Watertown	1877
Corson	4,181	2,473	McIntosh	1909
Custer	7,275	1,558	Custer	1875
Davison	18,741	436	Mitchell	1873
Day	6,267	1,029	Webster	1879
Deuel	4,498	624	Clear Lake	1862
Dewey	5,972	2,303	Timber Lake	1873
Douglas	3,458	434	Armour	1873
Edmunds	4,367	1,146	Ipswich	1873
Fall River	7,453	1,740	Hot Springs	1883
Faulk	2,640	1,000	Faulkton	1873
Grant	7,847	682	Milbank	1873
Gregory	4,792	1,016	Burke	1862
Haakon	2,196	1,813	Philip	1914
Hamlin	5,540	511	Hayti	1873
Hand	3,741	1,437	Miller	1873
Hanson	3,139	435	Alexandria	1873
Harding	1,353	2,671	Buffalo	1909
Hughes	16,481	741	Pierre	1880
Hutchinson	8,075	813	Olivet	1862
Hyde	1,671	861	Highmore	1873
Jackson	2,930	1,869	Kadoka	1914
Jerauld	2,295	530	Wessington Springs	1883
Jones	1,193	971	Murdo	1916
Kingsbury	5,815	838	De Smet	1873
Lake	11,276	563	Madison	1873
Lawrence	21,802	800	Deadwood	1875
Lincoln	24,131	578	Canton	1867
Lyman	3,895	1,640	Kennebec	1873
Marshall	4,576	839	Britton	1885
McCook	5,832	575	Salem	1873
McPherson	2,904	1,137	Leola	1873
Meade	24,253	3,471	Sturgis	1889
Mellette	2,083	1,307	White River	1909
Miner	2,884	570	Howard	1873
Minnehaha	148,281	809	Sioux Falls	1862
Moody	6,595	520	Flandreau	1873
Pennington	88,565	2,776	Rapid City	1875
Perkins	3,363	2,872	Bison	1909
Potter	2,693	866	Gettysburg	1875
Roberts	10,016	1,101	Sisseton	1883
Sanborn	2,675	569	Woonsocket	1883
Shannon	12,466	2,094	Hot Springs	1875
Spink	7,454	1,504	Redfield	1873
Stanley	2,772	1,443	Fort Pierre	1873
Sully	1,556	1,007	Onida	1873
Todd	9,050	1,388	Winner	1909
Tripp	6,430	1,614	Winner	1873
Turner	8,849	617	Parker	1871
Union	12,584	460	Elk Point	1862
Walworth	5,974	708	Selby	1873
Yankton	21,652	522	Yankton	1862
Ziebach	2,519	1,962	Dupree	1911

Information from NACo
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