| Pharmacists Mutual Insurance Company | Finance and Insurance | $5,277,400 | $5,389,985 | 250 | $128.4M |  Research |
| Kossuth Regional Health Center | Health Care and Social Assistance | $3,084,900 | $3,120,034 | 189 | N/A | Research |
| Stueve Construction Company | Construction | $1,261,175 | $1,268,147 | 68 | $77.5M | Research |
| Reding Gravel & Excavating Company | Construction | $817,258 | $827,065 | 50 | $18.7M | Research |
| Erpelding, Voigt & Co, LLP | Professional, Scientific, and Technical Services | $580,900 | $693,512 | 50 | $15.9M | Research |
| Suidae Health & Production, PC | Professional, Scientific, and Technical Services | $494,900 | $497,718 | 30 | <$5M | Research |
| Bishop Garrigan Schools | Other Services (except Public Administration) | $487,700 | $491,019 | 199 | N/A | Research |
| Kemna Motor Company | Retail Trade | $426,000 | $431,207 | 30 | $7.6M | Research |
| Central Financial Group, Lc | Finance and Insurance | $413,000 | $613,282 | 40 | $20.6M | Research |
| Algona Manor Care Center, Inc. | Health Care and Social Assistance | $379,400 | $381,529 | 44 | $7.5M | Research |
| Jack's O.k. Tire Service Co | Retail Trade | $378,100 | $380,190 | 39 | $10.5M | Research |
| Sbemco International, Inc. | Manufacturing | $356,400 | $356,771 | 24 | $8.5M | Research |
| North Iowa Lumber & Design, Inc. | Retail Trade | $346,100 | $348,146 | 35 | $7.2M | Research |
| Sbemco International, Inc. | Manufacturing | $327,355 | $328,674 | 21 | $7.4M | Research |
| Louscher Family Dentistry LLC | Health Care and Social Assistance | $275,600 | $276,781 | 26 | $6.0M | Research |
| Evolution Driveline, LLC | Manufacturing | $257,500 | $260,318 | 33 | $8.6M | Research |
| Buchanan Bibler Gabor & Meis | Professional, Scientific, and Technical Services | $244,920 | $247,587 | 18 | <$5M | Research |
| Erpelding Excavating Enterprise Corp | Construction | $240,700 | $243,415 | 20 | $7.5M | Research |
| Advanced Crop Management, Inc. | Agriculture, Forestry, Fishing and Hunting | $232,800 | $234,132 | 28 | <$5M | Research |
| Louscher Family Dentistry LLC | Health Care and Social Assistance | $228,450 | $229,586 | 24 | $5.6M | Research |
| Active Senior Citizens of Algona | Other Services (except Public Administration) | $179,752 | $0 | 11 | N/A | Research |
| Algona Family Ymca | Other Services (except Public Administration) | $172,000 | $82,917 | 79 | N/A | Research |
| Farm Employment Serveices, LLC | Agriculture, Forestry, Fishing and Hunting | $171,000 | $172,971 | 22 | <$5M | Research |
| American Power Group, Inc. | Professional, Scientific, and Technical Services | $158,395 | $159,535 | 7 | <$5M | Research |
| American Power Group, Inc. | Manufacturing | $153,500 | $154,395 | 7 | <$5M | Research |