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South Dakota— USA

Companies in South Dakota

179.1K companies registered in South Dakota, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the South Dakota business base breaks down by industry and headcount.

179.1K
companies
#44
of 50 states
0.3%
of US records
15
industries ranked
September 2026
data updated

Part of the United States company directory.

Rankings

Largest companies in South Dakota

By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.

#CompanyIndustryCityRevenue (USD)Employees
1Citibank, National AssociationOther monetary intermediationSioux Falls$114.8B178,017
2Black Hills CorporationElectric power generation, transmission and distributionRapid City$2.3B2,795
3Northwestern Energy Group IncorporatedElectric power generation, transmission and distributionSioux Falls$1.6B1,667
4Northwestern CorporationElectric power generation, transmission and distributionSioux Falls$1.3B1,530
5Monument Health Rapid City Hospital, Inc.Hospital activitiesRapid City$1.2B4,258
6Pathward Financial, Inc.Other monetary intermediationSioux Falls$851M1,182
7Daktronics, Inc.Manufacture of electric lighting equipmentBrookings$839M2,423
8Monument Health Rapid City Hospital, Inc.Hospital activitiesRapid City$830M4,200
9Pathward, National AssociationOther monetary intermediationSioux Falls$806M1,170
10South Dakota Soybean Processors, LLCManufacture of oils and fatsVolga$504M139
11Black Hills Service Company, LLCTrade of gas through mainsRapid City$427M492
12Sioux Falls School District No 49-5Primary educationSioux Falls$391M3,300
13East River Electric Power Cooperative, Inc.Electric power generation, transmission and distributionMadison$357M126
14Black Hills Power, Inc.Electric power generation, transmission and distributionRapid City$348M326
15Avera Health Plans, Inc.Non-life insuranceSioux Falls$342M45
16First Bank & TrustOther monetary intermediationBrookings$308M695
17Black Hills Colorado Electric, LLCTrade of gas through mainsRapid City$287M200
18Lake Area Corn Processors, LLCManufacture of other organic basic chemicalsWentworth$280M47
19Northwestern Energy Public Service CorporationElectric power generation, transmission and distributionSioux Falls$278M6
20Dacotah BankOther monetary intermediationAberdeen$253M585
21South Dakota Housing Development AuthorityBusiness and other management consultancy activitiesPierre$236M65
221st Financial Bank USAOther monetary intermediationNorth Sioux City$230M305
23First Premier BankOther monetary intermediationSioux Falls$217M377
24Sanford Health FoundationNon-life insuranceSioux Falls$214M23
25Monument Health Network, Inc.Hospital activitiesRapid City$211M307

Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.

Citibank, National Association leads South Dakota at $114.8B in reported revenue, from Sioux Falls.

Coverage

Companies by industry in South Dakota

The industries holding the most companies, by NACE activity code.

Other business support service activities n.e.c.8299
9,504
Mixed farming0150
7,385
Management of real estate on a fee or contract basis6832
5,711
Construction of residential and non-residential buildings4120
5,034
Trusts, funds and similar financial entities6430
4,770
Growing of cereals (except rice), leguminous crops and oil seeds0111
4,558
Business and other management consultancy activities7022
4,526
Raising of dairy cattle0141
3,611
Activities of other membership organisations n.e.c.9499
3,582
Restaurants and mobile food service activities5610
3,563
Other human health activities8690
3,366
Maintenance and repair of motor vehicles4520
2,996
Repair of other personal and household goods9529
2,973
Activities of religious organisations9491
2,812
Real estate agencies6831
2,749

Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.

Browse these directories

Other business support service activities n.e.c. is the largest activity in South Dakota, with 9,504 companies.

Distribution

Company size

By number of employees.

1-4
156,645
5-9
11,184
10-19
3,740
20-49
2,440
50-99
896
100-199
482
200-499
287
500-999
72
1000+
53

3,256 companies have no disclosed headcount (excluded from the chart).

89% of South Dakota companies with a disclosed headcount fall in the 1-4 employee band.

Data coverage

What a South Dakota record carries

Share of the state's companies holding each contact field.

25%

with a website

45%

with a phone number

18%

with an email address

Counted against the 179.1K companies in South Dakota. Firmographics — industry, size, address, status — are present on every record.

FAQ

Companies in South Dakota — frequently asked questions

There are 179.1K companies registered in South Dakota in the InfobelPRO database, across every sector from sole proprietorships to large enterprises.
By revenue reported to the register, the largest company headquartered in South Dakota is Citibank, National Association, based in Sioux Falls, in other monetary intermediation.
Other business support service activities n.e.c. (9,504 companies), Mixed farming (7,385 companies), Management of real estate on a fee or contract basis (5,711 companies) lead the South Dakota business base by number of companies.
Registered name and address, industry classification in NACE, SIC and NAICS, company status and legal form, employee band, reported revenue where filed, and contact fields — website, phone and email — where available.
Yes. The South Dakota file is available as a bulk export or through the API, filtered by industry, company size, city or revenue. Licensing is on volume and use, not per seat.

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