| County | FIPS-code | Provincie zetel | Gevestigd | Gevormd uit | Betekenis van de naam | Bevolking | Gebied | Kaart |
| Aurora County | 003 | Plankinton | 1881 | Cragin en Wetmore counties | Aurora, Romeinse godin van de dageraad | 7003271000000000000♠2,710 | 700270800000000♠708 sq mi (7003183400000000000♠1,834 km2) |  |
| Beadle County | 005 | Huron | 1879 | Buchard, Clark, Kingsbury, en Spink counties | William Henry Harrison Beadle, hoofd landmeter van Dakota Territory | 7004173980000000000♠17,398 | 7003125900000000000♠1,259 sq mi (7003326100000000000♠3,261 km2) |  |
| BennettCounty | 007 | Martin | 1909 | Lugenbeel, Shannon, Washabaugh, en Washington counties | Granville G. Bennett, rechter bij het Hooggerechtshof voor het Dakota Territorium | 7003343100000000000♠3,431 | 7003118500000000000♠1,185 sq mi (7003306900000000000♠3,069 km2) |  |
| Bon Homme County | 009 | Tyndall | 1862 | Ongeorganiseerd gebied | Frans woord dat "goede man" betekent | 7003707000000000000♠7,070 | 700256300000000♠563 vierkante mijl (7003145800000000000♠1,458 km2) |  |
| Brookings County | 011 | Brookings | 1862 | Ongeorganiseerd gebied | Wilmot Brookings (1830 - 1905), rechter in het Hooggerechtshof van Dakota Territory | 7004319650000000000♠31,965 | 7002794000000000000♠794 vierkante mijl (7003205600000000000♠2,056 km2) |  |
| Brown County | 013 | Aberdeen | 1879 | Beadle County | Alfred Brown, territoriaal wetgever | 7004365310000000000♠36,531 | 7003171300000000000♠1,713 sq mi (7003443700000000000♠4,437 km2) |  |
| Brule County | 015 | Chamberlain | 1875 | Charles Mix County | Brulé Sioux Inheemse Amerikanen | 7003525500000000000♠5,255 | 7002819000000000000♠819 sq mi (700321210000000000000♠2,121 km2) |  |
| BuffaloCounty | 017 | Gann Valley | 1873 | Ongeorganiseerd gebied | Amerikaanse bizon | 7003191200000000000♠1,912 | 7002471000000000000♠471 vierkante mijl (70031220000000000♠1,220 km2) |  |
| ButteCounty | 019 | Belle Fourche | 1883 | Harding | Buttes in de regio | 7004101100000000000♠10,110 | 7003224900000000000♠2,249 sq mi (7003582500000000000♠5,825 km2) |  |
| Campbell County | 021 | Mound City | 1873 | Buffalo | Newton B. Campbell, territoriaal wetgever | 7003146600000000000♠1,466 | 700273600000000♠736 sq mi (7003190600000000000♠1,906 km2) |  |
| Charles Mix County | 023 | Meer van Andes | 1862 | Ongeorganiseerd gebied | Charles Eli Mix, commissaris van Indianenzaken | 7003912900000000000♠9,129 | 7003109800000000000♠1,098 sq mi (7003284400000000000♠2,844 km2) |  |
| Clark County | 025 | Clark | 1873 | Hanson | Newton Clark, territoriaal wetgever | 7003369100000000000♠3,691 | 700295800000000♠958 vierkante mijl (7003248100000000000♠2,481 km2) |  |
| Clay County | 027 | Vermillion | 1862 | Ongeorganiseerd gebied | Henry Clay (1777 - 1852), Amerikaans senator uit Kentucky en prominent politicus in de 19e eeuw | 7004138640000000000♠13,864 | 7002412000000000000♠412 sq mi (7003106700000000000♠1,067 km2) |  |
| Codington County | 029 | Watertown | 1877 | Indiaanse landen | Eerwaarde G.S. Codington, territoriaal wetgever | 7004272270000000000♠27,227 | 700268800000000♠688 sq mi (7003178200000000000♠1,782 km2) |  |
| Corson County | 031 | McIntosh | 1909 | Indiaanse landen | Dighton Corson, een rechter van het Hooggerechtshof van South Dakota | 7003405000000000000♠4,050 | 7003247300000000000♠2,473 sq mi (7003640500000000000♠6,405 km2) |  |
| Custer County | 033 | Custer | 1875 | Indiaanse landen | Generaal George Armstrong Custer (1839 - 1876), sleutelfiguur in de Indiaanse oorlogen | 7003821600000000000♠8,216 | 7003155800000000000♠1,558 sq mi (7003403500000000000♠4,035 km2) |  |
| Davison County | 035 | Mitchell | 1873 | Hanson | Henry C. Davison, prominent koopman en vroege kolonist | 7004195040000000000♠19,504 | 7002436000000000000♠436 sq mi (7003112900000000000♠1,129 km2) |  |
| Dag Provincie | 037 | Webster | 1879 | Clark | Merrit H. Day, territoriaal wetgever | 7003571000000000000♠5,710 | 7003102900000000000♠1,029 sq mi (7003266500000000000♠2,665 km2) |  |
| Deuel County | 039 | Clear Lake | 1862 | Brookings | Jacob S. Deuel, territoriaal wetgever | 7003436400000000000♠4,364 | 700262400000000♠624 sq mi (7003161600000000000♠1,616 km2) |  |
| Dewey County | 041 | Timber Lake | 1873 | Armstrong County en Indiaans land | William P. Dewey, territoriaal inspecteur-generaal | 7003530100000000000♠5,301 | 7003230300000000000♠2,303 sq mi (7003596500000000000♠5,965 km2) |  |
| Douglas County | 043 | Pantser | 1873 | Charles Mix | Stephen A. Douglas (1813 - 1861), Amerikaans senator uit Illinois en voorstander van volkssoevereiniteit als middenweg in het slavernijdebat | 7003300200000000000♠3,002 | 7002434000000000000♠434 sq mi (7003112400000000000♠1,124 km2) |  |
| Edmunds County | 045 | Ipswich | 1873 | Buffalo | Newton Edmunds, gouverneur van Dakota Territory | 7003407100000000000♠4,071 | 7003114600000000000♠1,146 sq mi (7003296800000000000♠2,968 km2) |  |
| FallRiver County | 047 | Hot Springs | 1883 | Custer | Fall River | 7003709400000000000♠7,094 | 7003174000000000000♠1,740 sq mi (7003450700000000000♠4,507 km2) |  |
| Faulk County | 049 | Faulkton | 1873 | Niet-georganiseerde landerijen | Andrew Jackson Faulk, gouverneur van Dakota Territory | 7003236400000000000♠2,364 | 700310000000000♠1,000 sq mi (7003259000000000000♠2,590 km2) |  |
| Grant County | 051 | Milbank | 1873 | Codington en Deuel counties | Ulysses S. Grant (1822 - 1885), Amerikaans president en generaal in de Amerikaanse Burgeroorlog | 7003735600000000000♠7,356 | 700268200000000♠682 vierkante mijl (7003176600000000000♠1,766 km2) |  |
| Gregory County | 053 | Burke | 1862 | Ongeorganiseerd gebied | John Shaw Gregory, territoriaal wetgever | 7003427100000000000♠4,271 | 7003101600000000000♠1,016 sq mi (7003263100000000000♠2,631 km2) |  |
| Haakon County | 055 | Philip | 1914 | Stanley County | Koning Haakon VII van Noorwegen | 7003193700000000000♠1,937 | 7003181300000000000♠1,813 sq mi (7003469600000000000♠4,696 km2) |  |
| Hamlin County | 057 | Hayti | 1873 | Deuel County | HannibalHamlin, vice-president en senator van de Verenigde Staten uit Maine | 7003590300000000000♠5,903 | 7002511000000000000♠511 sq mi (7003132300000000000♠1,323 km2) |  |
| Hand County | 059 | Miller | 1873 | Buffalo County | George H. Hand, territoriaal wetgever | 7003343100000000000♠3,431 | 7003143700000000000♠1,437 sq mi (7003372200000000000♠3,722 km2) |  |
| Hanson County | 061 | Alexandria | 1873 | Buffalo en Deuel counties | Joseph R. Hanson, legermajoor in de Indiaanse oorlogen en vroege kolonist | 7003333100000000000♠3,331 | 7002435000000000000♠435 sq mi (7003112700000000000♠1,127 km2) |  |
| Harding County | 063 | Buffalo | 1909 | Niet-georganiseerde landerijen | J.A. Harding, voorzitter van het Huis voor Dakota Territory | 7003125500000000000♠1,255 | 7003267100000000000♠2,671 sq mi (7003691800000000000♠6,918 km2) |  |
| Hughes County | 065 | Pierre | 1880 | Buffalo County | Alexander Hughes, territoriaal wetgever | 7004170220000000000♠17,022 | 700274100000000♠741 sq mi (7003191900000000000♠1,919 km2) |  |
| Hutchinson County | 067 | Olivet | 1862 | Ongeorganiseerd gebied | John Hutchinson, territoriaal wetgever | 7003734300000000000♠7,343 | 700281300000000♠813 sq mi (7003210600000000000♠2,106 km2) |  |
| Hyde County | 069 | Highmore | 1873 | Buffalo County | James Hyde, territoriaal wetgever | 7003142000000000000♠1,420 | 70028610000000000♠861 vierkante mijl (7003223000000000000♠2,230 km2) |  |
| Jackson County | 071 | Kadoka | 1914 | Stanley County | J.R. Jackson, territoriaal wetgever | 7003303100000000000♠3,031 | 7003186900000000000♠1,869 sq mi (7003484100000000000♠4,841 km2) |  |
| JerauldCounty | 073 | Wessington Springs | 1883 | Aurora County | H.A. Jerauld, territoriaal wetgever | 7003207000000000000♠2,070 | 7002530000000000000♠530 sq mi (7003137300000000000♠1,373 km2) |  |
| Jones County | 075 | Murdo | 1916 | Lyman County | George W. Jones, territoriaal wetgever | 7003100600000000000♠1,006 | 700297100000000♠971 sq mi (7003251500000000000♠2,515 km2) |  |
| KingsburyCounty | 077 | De Smet | 1873 | Hanson County | George W. Kingsbury en T.A. Kingsbury, broers en territoriale wetgevers | 7003514800000000000♠5,148 | 700283800000000♠838 sq mi (7003217000000000000♠2,170 km2) |  |
| Lake County | 079 | Madison | 1873 | Brookings en Hanson counties | Meren in het graafschap | 7004112000000000000♠11,200 | 700256300000000♠563 vierkante mijl (7003145800000000000♠1,458 km2) |  |
| Lawrence County | 081 | Deadwood | 1875 | Ongeorganiseerd gebied | John Lawrence (1839 - 1889), territoriaal wetgever | 7004240970000000000♠24,097 | 700280000000000♠800 sq mi (7003207200000000000♠2,072 km2) |  |
| Lincoln County | 083 | Canton | 1867 | Ongeorganiseerd gebied | Lincoln County, Maine | 7004448280000000000♠44,828 | 7002578000000000000♠578 sq mi (7003149700000000000♠1,497 km2) |  |
| Lyman County | 085 | Kennebec | 1873 | Ongeorganiseerd gebied | W.P. Lyman, territoriaal wetgever | 7003375500000000000♠3,755 | 700316400000000♠1,640 sq mi (7003424800000000000♠4,248 km2) |  |
| MarshallCounty | 091 | Britton | 1885 | Dag Provincie | Marshall Vincent, Day County Commissaris | 7003465600000000000♠4,656 | 7002839000000000000♠839 sq mi (7003217300000000000♠2,173 km2) |  |
| McCook County | 087 | Salem | 1873 | Hanson County | Edwin McCook, secretaris van Dakota Territory | 7003561800000000000♠5,618 | 7002575000000000000♠575 vierkante mijl (7003148900000000000♠1,489 km2) |  |
| McPherson County | 089 | Leola | 1873 | Buffalo County | James B. McPherson (1828 - 1864), generaal in de Burgeroorlog | 7003245900000000000♠2,459 | 7003113700000000000♠1,137 sq mi (7003294500000000000♠2,945 km2) |  |
| Meade County | 093 | Sturgis | 1889 | Lawrence County | George G. Meade (1815 - 1872), generaal in de Burgeroorlog | 7004254340000000000♠25,434 | 7003347100000000000♠3,471 sq mi (700389900000000♠8,990 km2) |  |
| Mellette County | 095 | Witte Rivier | 1909 | Lyman County | Arthur C. Mellette, eerste gouverneur van South Dakota | 7003204800000000000♠2,048 | 7003130700000000000♠1,307 sq mi (7003338500000000000♠3,385 km2) |  |
| Miner County | 097 | Howard | 1873 | Hanson County | Nelson Miner en Ephriam Miner, broers en territoriale wetgevers | 7003238900000000000♠2,389 | 7002570000000000000♠570 sq mi (7003147600000000000♠1,476 km2) |  |
| Minnehaha County | 099 | Sioux Falls | 1862 | Ongeorganiseerd gebied | Sioux term voor waterval | 7005169468000000000♠169,468 | 700280900000000♠809 sq mi (7003209500000000000♠2,095 km2) |  |
| Moody County | 101 | Flandreau | 1873 | Brookings en Minnehaha counties | Gideon C. Moody, voorzitter van het Huis voor Dakota Territory | 7003648600000000000♠6,486 | 7002520000000000000♠520 sq mi (7003134700000000000♠1,347 km2) |  |
| Oglala Lakota County | 102 | Hot Springs | 1875 | Fall River County | Oglala Lakota stam | 7004135860000000000♠13,586 | 7003209400000000000♠2,094 sq mi (7003542300000000000♠5,423 km2) |  |
| Pennington County | 103 | Rapid City | 1875 | Ongeorganiseerd gebied | John L. Pennington (1821 - 1900), gouverneur van Dakota Territory | 7005100948000000000♠100,948 | 7003277600000000000♠2,776 sq mi (700371900000000♠7,190 km2) |  |
| Perkins County | 105 | Bison | 1909 | Butte en Harding counties | Henry E. Perkins, staatssenator | 7003298200000000000♠2,982 | 7003287200000000000♠2,872 sq mi (7003743800000000000♠7,438 km2) |  |
| Potter County | 107 | Gettysburg | 1875 | Buffalo County | Joel A. Potter, territoriaal wetgever | 7003232900000000000♠2,329 | 700286600000000♠866 vierkante mijl (7003224300000000000♠2,243 km2) |  |
| Roberts County | 109 | Sisseton | 1883 | Grant County | S.G. Roberts, territoriaal wetgever | 7004101490000000000♠10,149 | 7003110100000000000♠1,101 sq mi (7003285200000000000♠2,852 km2) |  |
| Sanborn County | 111 | Woonsocket | 1883 | Miner County | George W. Sanborn, president van de Milwaukee Railroad | 7003235500000000000♠2,355 | 700256900000000♠569 sq mi (7003147400000000000♠1,474 km2) |  |
| Spink County | 115 | Redfield | 1873 | Hanson County | S.L. Spink, Secretaris van Dakota Territory | 7003645100000000000♠6,451 | 7003150400000000000♠1,504 sq mi (7003389500000000000♠3,895 km2) |  |
| Stanley County | 117 | Fort Pierre | 1873 | Ongeorganiseerd gebied | David S. Stanley, commandant van Fort Sully | 7003296600000000000♠2,966 | 7003144300000000000♠1,443 sq mi (7003373700000000000♠3,737 km2) |  |
| Sully County | 119 | Onida | 1873 | Potter County | Fort Sully, zelf vernoemd naar Generaal Alfred Sully | 7003137300000000000♠1,373 | 7003100700000000000♠1,007 sq mi (7003260800000000000♠2,608 km2) |  |
| Todd County | 121 | Winnaar | 1909 | Meyer en Tripp counties | John Blair Smith Todd, territoriaal afgevaardigde naar het Congres | 7003961200000000000♠9,612 | 7003138800000000000♠1,388 sq mi (7003359500000000000♠3,595 km2) |  |
| Tripp County | 123 | Winnaar | 1873 | Ongeorganiseerd gebied | Bartlett Tripp, opperrechter van het Hooggerechtshof van Dakota Territorial | 7003564400000000000♠5,644 | 7003161400000000000♠1,614 sq mi (700341800000000♠4,180 km2) |  |
| Turner County | 125 | Parker | 1871 | Lincoln County | John W. Turner, territoriaal wetgever | 7003834700000000000♠8,347 | 700261700000000♠617 sq mi (7003159800000000000♠1,598 km2) |  |
| Union County | 127 | Elk Point | 1862 | Ongeorganiseerd gebied | De unie van de Amerikaanse staten | 7004143990000000000♠14,399 | 7002460000000000000♠460 sq mi (7003119100000000000♠1,191 km2) |  |
| Walworth County | 129 | Selby | 1873 | Buffalo County | Walworth County, Wisconsin | 7003543800000000000♠5,438 | 700270800000000♠708 sq mi (7003183400000000000♠1,834 km2) |  |
| Yankton County | 135 | Yankton | 1862 | Ongeorganiseerd gebied | Yankton Sioux Inheemse Amerikanen | 7004224380000000000♠22,438 | 700252200000000♠522 vierkante mijl (70031352000000000♠1,352 km2) |  |
| Ziebach County | 137 | Dupree | 1911 | Armstrong, Schnasse, en Sterling counties | Frank M. Ziebach, uitgever en legermajoor tijdens de Indiaanse oorlogen | 7003280100000000000♠2,801 | 7003196200000000000♠1,962 sq mi (7003508200000000000♠5,082 km2) |  |