| IS HEALTHCARE, LLC | FL142956 | 2018-01-23 | Active | FARGO |
| IS Properties, LLC | DL191780 | 2020-11-24 | Active | Mitchell |
| IS Realty, LLC | DL196435 | 2021-02-10 | Active | Sioux Falls |
| IS Restaurant Equipment Services, LLC | DL168511 | 2019-08-08 | Active | Sioux Falls |
| IS TRUCKING INC | DB155306 | 2018-10-18 | Dissolved | Watertown |
| IS4 LLC | DL179866 | 2020-04-13 | Dissolved | Sioux Falls |
| ISA ACCEPTANCE CORPORATION | FB033602 | 2009-06-29 | Revoked | SAINT PAUL |
| ISA INFORMATION SYSTEMS SERVICES, INC. | FB015389 | 1992-07-17 | Revoked | DALLAS |
| ISAAC & TREVOR & ASSOCIATES INC | DB185832 | 2020-08-10 | Dissolved | CROOKS |
| ISAAC CLEWLEY POST NO. 4917 VETERANS OF FOREIGN WARS OF THE UNITED STATES, INCORPORATED | 19470030ND | 1947-06-05 | Merged | — |
| ISAAC HERMAN BUSINESS LLC | DL316602 | 2025-12-29 | Active | SIOUX FALLS |
| ISAAC MARSHALL GILES POST NO. 3475, V. F. W. | 19660063ND | 1966-10-21 | Dissolved | — |
| Isaac Silvera 2020 FT LLC | DL326206 | 2026-04-16 | Active | Sioux Falls |
| Isaac The Handyman LLC | DL211185 | 2021-09-28 | Active | Hot Springs |
| ISAACL CO. LLC | DL032063 | 2013-04-15 | Dissolved | OGLALA |
| ISAACS AIR SERVICE, INC. | DB022025 | 1982-12-27 | Inactive | — |
| ISAACS BEHAVIORAL HEALTH LLC | DL170554 | 2019-09-23 | Active | Rapid City |
| ISAACS CATTLE CO., INC. | DF005474 | 1948-07-06 | Inactive | — |
| ISAACS FAMILY LLLP | FP000845 | 2013-08-23 | Suspended | ENGLEWOOD |
| ISAACS LAND AND LIVESTOCK COMPANY, INC. | DB032958 | 1993-04-27 | Inactive | — |
| ISAACS REALTY, LLC | DL006877 | 2004-01-29 | Inactive | — |
| ISAACSON ENTERPRISES, LLC | DL009821 | 2005-09-12 | Dissolved | — |
| ISAAK AGENCY, INC. | DB051878 | 2006-12-29 | Active | ABERDEEN |
| ISABEL BAPTIST CHURCH | CH001093 | 1911-08-12 | Inactive | — |
| ISABEL BETTERMENT SOCIETY | NS012160 | 2002-11-14 | Dissolved | ISABEL |
| ISABEL COOP FOOD STORES, INC. | CO000771 | 1983-04-26 | Inactive | — |
| ISABEL COOPERATIVE, INC. | CO000745 | 1980-04-11 | Dissolved | ISABEL |
| Isabel Daycare Visions in Progress | NS050097 | 2016-09-06 | Dissolved | Isabel |
| ISABEL DEVELOPMENT COMPANY, INC. | DB008662 | 1968-10-11 | Dissolved | ISABEL |
| Isabel Future Visions | NS270734 | 2024-03-14 | Active | Isabel |
| ISABEL HARDWARE AND LUMBER, INC. | DB002734 | 1962-04-27 | Dissolved | — |
| ISABEL RODEO ASSOCIATION | NS000415 | 1961-07-31 | Active | ISABEL |
| ISABEL SENIOR CITIZENS CENTER, INC. | NS006300 | 1977-08-01 | Dissolved | ISABEL |
| ISABEL SERVICE, L.L.C. | DL000018 | 1993-08-12 | Inactive | — |
| ISABEL VOLUNTEER FIRE DEPT. INC. | NS012104 | 2002-09-12 | Active | ISABEL |
| ISAIAH 61 LLC | DL028476 | 2012-06-13 | Active | SIOUX FALLS |
| ISAKSON ENTERPRISES, INC. | DB022422 | 1983-05-20 | Inactive | — |
| ISAKSON FAMILY, LLC | DL036593 | 2013-12-26 | Dissolved | SIOUX FALLS |
| ISAKSON LIMITED PARTNERSHIP | DP001418 | 2003-02-18 | Inactive | — |
| Isanthes, LLC | FL208852 | 2021-08-23 | Revoked | Las Vegas |
| Isanti Dakota Mechanical LLC | DL324955 | 2026-04-01 | Active | Manderson |
| ISAVA, INC. | DB056740 | 2012-03-14 | Dissolved | SIOUX CITY |
| ISB INSURANCE, INC. | FB024526 | 2000-11-13 | Revoked | HULL |
| ISBHCSSD, LLC | DL333972 | 2026-07-17 | Active | Sarasota |
| Isbjorn Carriage, LLC | DL151643 | 2018-07-27 | Inactive | Sioux Falls |
| Isburg Central Enterprises, L.L.C. | DL216061 | 2021-12-08 | Inactive | Spearfish |
| ISBURG ENTERPRISES, INC. | DB043485 | 2000-12-11 | Active | SPEARFISH |
| ISBURG FUNERAL HOME, INC. | DB014606 | 1977-08-19 | Inactive | — |
| Isburg Properties, LLC | DL229349 | 2022-06-22 | Active | Spearfish |
| ISC Academy, LLC | DL207475 | 2021-07-30 | Dissolved | Yankton |
| ISC Companies, Inc. | FB038584 | 2015-05-12 | Inactive | MINNEAPOLIS |
| ISC CONSTRUCTORS, LLC | FL002299 | 2005-03-04 | Active | BATON ROUGE |
| ISC HOLDINGS, INC. | FB023535 | 2000-02-14 | Revoked | MIDLAND |
| ISC SUBSIDIARY CORPORATION | FB014623 | 1991-06-14 | Revoked | NEW YORK |
| ISC SYSTEMS CORPORATION OF AMERICA | FB010959 | 1986-07-07 | Revoked | SPOKANE, |
| ISC, LLC | DL242567 | 2023-01-19 | Active | Brandon |
| ISCHEMAVIEW, INC. | FB270939 | 2024-03-18 | Active | Menlo Park |
| Ischen Farm LLC | DL301450 | 2025-05-31 | Active | Artesian |
| ISCO Enterprises, LLC | DL193433 | 2020-12-22 | Active | Rapid City |
| ISCO Finance, LLC | DL193432 | 2020-12-22 | Active | Rapid City |
| ISCO, INC. | FB034099 | 2010-02-02 | Revoked | WEST MEMPHIS |
| ISCO18 LIMITED PARTNERSHIP | DP128750 | 2016-12-16 | Active | PIERRE |
| ISD INVESTMENTS, LLC | DL138686 | 2017-10-19 | Inactive | Sioux Falls |
| ISD National Clinic, LLC | DL264287 | 2023-12-13 | Active | Watertown |
| ISDI GP LLC | DL140719 | 2017-12-07 | Active | Sioux Falls |
| ISEC, Incorporated | FB038254 | 2014-11-21 | Active | GREENWOOD VILLAGE |
| ISEMAN CORP. | DB021465 | 1982-04-23 | Dissolved | TROY |
| ISEMAN HOMES OF MONTANA, INC. | DB057852 | 2013-06-13 | Active | Sioux Falls |
| ISEMAN HOMES, INC. | DB049863 | 2005-06-17 | Active | SIOUX FALLS |
| ISEMAN MANAGEMENT, INC. | DB025381 | 1986-05-09 | Dissolved | — |
| ISEMAN SERVICE, INC. | DB025359 | 1986-05-01 | Dissolved | — |
| ISEMINGER & ASSOCIATES, INC. | DB060209 | 2015-07-17 | Dissolved | SIOUX FALLS |
| ISEMINGER PROFESSIONAL SERVICES, INC. | DB036381 | 1995-11-01 | Inactive | — |
| ISER Holdings LLC | FL149795 | 2018-06-18 | Active | DALLAS |
| ISERVE SERVICING, INC. | FB031861 | 2007-07-26 | Inactive | IRVING |
| ISF, LLC | DL285086 | 2024-10-15 | Active | Freeman |
| ISG Delivers, LLC | FL268954 | 2024-02-21 | Active | Mankato |
| ISG Difference, Inc. | DB265002 | 2023-12-22 | Active | Sioux Falls |
| ISG INTERNATIONAL, INC. | FB020998 | 1998-02-13 | Inactive | CAMBRIDGE |
| ISG Search Corporation | DB210951 | 2021-09-24 | Active | Miami |
| Isgesa, LLC | DL130669 | 2017-02-14 | Active | SIOUX FALLS |
| Ish Family Office LLC | DL215688 | 2021-12-03 | Active | O'Fallon |
| Ish Global Solutions LLC | DL215680 | 2021-12-03 | Active | O'Fallon |
| Ish Investments LLC | DL215682 | 2021-12-03 | Active | O'Fallon |
| Ish Ventures LLC | DL215686 | 2021-12-03 | Active | O'Fallon |
| ISHEES LLC | DL215032 | 2021-11-23 | Inactive | Watertown |
| ISHINEKO LLC | DL270451 | 2024-03-11 | Inactive | Watertown |
| Ishizaki Family LLC | DL042585 | 2015-03-23 | Inactive | Rapid City |
| Ishmael Farms, LLC | DL281084 | 2024-08-14 | Active | Winner |
| Ishmael Land & Cattle, LLC | DL281088 | 2024-08-14 | Active | Winner |
| ISHMAWIYL ORIENTAL CARPETS, INC. | DB032358 | 1992-12-02 | Inactive | — |
| IshNash LLC | DL187732 | 2020-09-15 | Active | SIOUX FALLS |
| ISHOPWITHAMOUSE.COM, LLC | DL013841 | 2007-05-07 | Dissolved | — |
| ISHPATA | NS289307 | 2024-12-18 | Active | Rapid City |
| Ishta LLC | DL213436 | 2021-11-01 | Active | Mountain View |
| Ishvara Inc. | DB161502 | 2019-03-11 | Active | Lincoln |
| ISI CONTROLS, LTD. | FB038688 | 2015-07-14 | Revoked | SAN ANTONIO |
| Isi GP LLC | DL181027 | 2020-05-05 | Inactive | — |
| ISI HR, Inc. | FB192814 | 2020-12-21 | Active | Sandy |
| ISI*MCS GP, INC. | FB031127 | 2006-11-08 | Revoked | SAN ANTONIO |
| ISI*MCS, LIMITED PARTNERSHIP | FP000662 | 2006-11-08 | Inactive | SAN ANTONIO |
| ISI, L.L.C. | DL029025 | 2012-08-06 | Active | CANISTOTA |
| ISIK LLC | DL033434 | 2013-08-12 | Dissolved | RAPID CITY |
| ISILON SYSTEMS LLC | FL005927 | 2011-10-21 | Inactive | HOPKINTON |
| Isinglass Guild Inc | DB323638 | 2026-03-18 | Active | Pierre |
| ISIS COMPANY, INC. | DB018972 | 1979-08-22 | Inactive | — |
| ISIS TECHNOLOGIES, LLC | DL029091 | 2012-08-13 | Inactive | RAPID CITY |
| ISK Investments LLC | DL248826 | 2023-04-17 | Suspended | New York |
| Iskandar Asset Management, LLC | DL316980 | 2026-01-02 | Active | Sioux Falls |
| Isla Holdings, LLC | DL326374 | 2026-04-17 | Active | San Leon |
| ISLA LLC | DL303032 | 2025-06-23 | Active | SIOUX FALLS |
| ISLAMIC ASSOCIATION OF THE BLACK HILLS | NS011613 | 2000-10-06 | Inactive | RAPID CITY |
| ISLAMIC CENTER OF SIOUX FALLS | NS009697 | 1992-09-01 | Active | SIOUX FALLS |
| ISLAMIC EDUCATION CENTER | NS014202 | 2010-01-08 | Dissolved | SIOUX FALLS |
| ISLAMIC SOCIETY OF BROOKINGS (ISB) | NS009076 | 1989-12-13 | Active | BROOKINGS |
| ISLAMIC SOCIETY OF MADISON | NS014717 | 2011-11-09 | Dissolved | MADISON |
| ISLAND BAR L.L.C. | DL042123 | 2015-01-29 | Dissolved | PIEDMONT |
| ISLAND CORP. | DB042625 | 2000-03-29 | Active | Spearfish |
| ISLAND CREEK COAL SALES COMPANY | 19330009D | 1933-04-10 | Dissolved | — |
| ISLAND CREEK INVESTORS, LLC | DL025047 | 2011-06-29 | Active | Sioux Falls |
| ISLAND DEVELOPMENT, LLC | DL017130 | 2008-08-08 | Inactive | OMAHA |
| Island Dragon MLG LLC | DL216612 | 2021-12-16 | Inactive | Kihei |
| ISLAND FALLS DEVELOPMENT CORPORATION | 19560058ND | 1956-09-10 | Suspended | — |
| ISLAND FALLS FIRE AND AMBULANCE CORPORATION | 19590048ND | 1959-12-10 | Active | — |
| Island Flavor, LLC | DL252350 | 2023-06-07 | Active | Aberdeen |
| Island in the Plains, LLC | DL202330 | 2021-05-05 | Active | Spearfish |
| ISLAND MANAGEMENT, LLC | DL027358 | 2012-02-28 | Dissolved | MADISON |
| ISLAND MEDICAL CENTER | 19660053ND | 1966-08-29 | Active | — |
| ISLAND MORTGAGE NETWORK, INC. | FB022616 | 1999-06-04 | Revoked | MELVILLE |
| ISLAND PARK, INC. | DB035287 | 1995-01-13 | Active | Yankton |
| Island Prairie, LLC | DL269260 | 2024-02-26 | Active | Spearfish |
| Island Properties LLC | DL021390 | 2010-05-03 | Active | RAPID CITY |
| Island Quest Investment Co | DB315173 | 2025-12-05 | Active | Box Elder |
| ISLAND TECHNOLOGIES INC. | DB055573 | 2010-08-30 | Active | Conyers |
| ISLAND TELEPHONE CO. | PU004462 | 1948-05-26 | Active | — |
| ISLAND TIME, INC. | DB048493 | 2004-07-12 | Dissolved | YANKTON |
| ISLAND TIME, L.L.C. | DL022989 | 2010-11-24 | Inactive | YANKTON |
| ISLAND VENTURES, LLC | DL031230 | 2013-02-06 | Dissolved | MADISON |
| ISLAND VIEW CORPORATION | 19670053ND | 1967-08-24 | Suspended | — |
| ISLAND, HARR AND YOUNG, LLP | DR000888 | 2005-02-15 | Inactive | — |
| IslandDream Properties LLC | DL042636 | 2015-03-09 | Dissolved | Sioux Falls |
| IslandLife, LLC | DL245145 | 2023-02-24 | Dissolved | Sioux Falls |
| ISLANDS COMMUNITY MEDICAL SERVICE | 19460020ND | 1946-08-17 | Active | — |
| Islands in the Hills, LLC | DL222650 | 2022-03-14 | Dissolved | Rapid City |
| Islandwoods, LLC | DL037459 | 2014-02-14 | Dissolved | ST PETERSBURG |
| ISLESBORO COMMUNITY FUND | 19500079ND | 1950-09-22 | Active | — |
| ISLESBORO HISTORICAL SOCIETY | 19640039ND | 1964-05-11 | Active | — |
| ISLESFORD CONGREGATIONAL SOCIETY | 18990004N | 1899-12-29 | Active | — |
| Islewave Inc | DB332371 | 2026-06-30 | Active | Watertown |
| ISLEY AND ASSOCIATES L.L.C. | DL029461 | 2012-09-19 | Dissolved | SIOUX FALLS |
| ISLEY COLORADO VENTURES LLC | DL032765 | 2013-06-10 | Dissolved | POCATELLO |
| ISLEY PROPERTIES, LLC | DL028443 | 2012-06-08 | Active | FARGO |
| ISLH, LLC | DL257755 | 2023-08-30 | Active | RAPID CITY |
| ISM INSURANCE, INC. | FB025701 | 2001-11-16 | Revoked | WILMINGTON |
| Ismael's Credit Repair Financial Services LLC | DL251686 | 2023-05-26 | Dissolved | SIOUX FALLS |
| Ismar Holdings LLC | DL191069 | 2020-11-11 | Active | Sioux Falls |
| ISMAY CATTLE COMPANY INC. | DB028879 | 1989-11-15 | Dissolved | — |
| Ismay Cattle Company, LLC | DL205079 | 2021-06-21 | Dissolved | Sturgis |
| Ismay Construction, LLC | DL040832 | 2014-10-27 | Inactive | Sturgis |
| ISMAY RANCH, LLC | DA006245 | 2003-09-10 | Active | Sturgis |
| Ismore Enterprise LLC | DL283753 | 2024-09-24 | Active | Custer |
| ISMORE INVESTMENTS LLC | FL226275 | 2022-05-03 | Revoked | Custer |
| Isn't It Lovely, LLC | DL237845 | 2022-11-02 | Active | Sioux Falls |
| ISO Fitness LLC | DL042066 | 2015-01-26 | Dissolved | ROCKFORD |
| ISO STAFF SERVICES, INC. | FB023868 | 2000-05-09 | Inactive | JERSEY CITY |
| Iso Zo, LLC | DL161410 | 2019-03-07 | Dissolved | Las Vegas |
| ISO, Inc. | DB059339 | 2014-08-22 | Dissolved | WATERTOWN |
| Isola Oversight Inc. | NS130610 | 2017-02-13 | Active | PIERRE |
| Isolation Sports, Inc. | DB179931 | 2020-04-14 | Dissolved | Rapid City |
| ISOLUX CORSAN, LLC | FL043810 | 2015-10-02 | Revoked | AUSTIN |
| iSolved National Broker Services, Inc. | FB030292 | 2006-01-19 | Active | CHARLOTTE |
| Isopure,Corp. | FB191099 | 2020-11-12 | Active | Louisville |
| ISOTECHNOLOGIES, INC. | FB012002 | 1988-03-25 | Revoked | HILLSBOROUGH |
| Isotropic LLC | DL330436 | 2026-06-04 | Active | Redmond |
| Isotropic Networks, Inc. | FB170454 | 2019-09-19 | Inactive | Lake Geneva |
| ISP CHANNEL, INC. | FB022555 | 1999-05-19 | Inactive | SAN FRANCISCO |
| ISP PAINTING, INC. | FB036268 | 2012-10-01 | Active | NAPERVILLE |
| ISPRental.com, LLC | DL163993 | 2019-05-01 | Dissolved | Sioux Falls |
| Ispy Detective Agency Inc. | DB183060 | 2020-06-15 | Suspended | Watertown |
| ISquared L.L.C | DL159995 | 2019-02-05 | Dissolved | Rapid City |
| ISRAEL 1 LLC | DL273856 | 2024-04-29 | Active | ABERDEEN |
| ISRAEL ANDERSON LLC | DL215004 | 2021-11-22 | Dissolved | Lead |
| ISRAEL UNITED IN CHRIST - CENTRAL - SD, INC | NS240310 | 2022-12-14 | Dissolved | PIERRE |
| Israeli-American Council | FN255704 | 2023-07-31 | Revoked | Woodland Hills |
| ISRAELSON MOTOR CO., INC. | 19460057D | 1946-01-08 | Suspended | — |
| ISRD LLC | DL166459 | 2019-06-24 | Dissolved | Sioux Falls |
| ISS FACILITY SERVICES, INC. | FB026665 | 2002-10-10 | Active | SAN ANTONIO |
| ISS RETAIL SERVICES, INC. | FB016197 | 1993-07-15 | Inactive | DOVER |
| ISS, LLC | DL031454 | 2013-02-27 | Suspended | HURON |
| Issa Ventures LLC | DL321254 | 2026-02-19 | Active | Hartford |
| Issa's Bazaar, LLC | DL298298 | 2025-04-18 | Active | Pierre |
| ISSAC'S HOUSE | NS014896 | 2012-07-25 | Dissolved | — |
| ISSEC LLC | DL220657 | 2022-02-15 | Active | Tucker |
| ISSENHUTH & LEIBEL, LLP | DR000387 | 1999-06-07 | Dissolved | MADISON |
| Isserman Consulting LLC | FL277282 | 2024-06-19 | Active | Sioux Falls |
| ISSUES MANAGEMENT, INC. | DB026888 | 1987-11-19 | Active | SIOUX FALLS |
| IST INTERNATIONAL, LLC | DL049911 | 2016-09-12 | Dissolved | Phoenix |
| ISTARI LLC | DL011033 | 2006-04-03 | Dissolved | EMERY |
| Istate Sioux Falls, LLC | FL128283 | 2016-12-02 | Active | Eagan |
| ISTATE TRUCK, INC. | FB035304 | 2011-07-25 | Active | Eagan |