| Bill Walsh Chevrolet-Cadillac, Inc. | Retail Trade | $2,834,200 | $2,865,534 | 242 | $61.0M |  Research |
| Grainco Fs, INC | Wholesale Trade | $2,247,580 | $2,273,614 | 130 | $33.5M | Research |
| Ottawa Dental Laboratory LLC | Manufacturing | $1,912,700 | $1,933,687 | 202 | $56.4M | Research |
| Ottawa Dental Laboratory LLC | Manufacturing | $1,869,577 | $1,879,756 | 196 | $54.7M | Research |
| Sigan America, LLC | Retail Trade | $1,678,800 | $1,689,173 | 112 | $19.5M | Research |
| Ottawa Pavillion, Ltd | Health Care and Social Assistance | $850,078 | $858,789 | 103 | $17.5M | Research |
| Hr Imaging Partners INC | Professional, Scientific, and Technical Services | $841,287 | $847,503 | 59 | $7.0M | Research |
| Hr Imaging Partners INC | Professional, Scientific, and Technical Services | $841,200 | $845,596 | 171 | $20.3M | Research |
| Tangled Roots Beverage Company LLC | Accommodation and Food Services | $831,800 | $838,940 | 93 | $16.5M | Research |
| Performance Pipelining INC | Construction | $809,332 | $812,210 | 41 | $12.7M | Research |
| Lotz Trucking, Inc. | Transportation and Warehousing | $655,685 | $659,422 | 61 | $9.2M | Research |
| Lotz Trucking Inc. | Transportation and Warehousing | $655,685 | $660,661 | 56 | $8.5M | Research |
| Prairie Transportation, Inc. | Transportation and Warehousing | $641,750 | $645,548 | 42 | $9.6M | Research |
| Tangled Roots Beverage Company LLC | Accommodation and Food Services | $594,200 | $599,828 | 93 | $16.5M | Research |
| Halm Electrical Contracting, Inc. | Construction | $580,293 | $583,581 | 33 | $10.9M | Research |
| Performance Pipelining INC | Construction | $451,908 | $456,628 | 32 | $9.9M | Research |
| Ottawa Friendship House Work Activity Center, Inc. | Health Care and Social Assistance | $422,172 | $424,439 | 57 | N/A | Research |
| Handy Foods INC | Retail Trade | $418,950 | $421,188 | 81 | $20.2M | Research |
| Marquette Academy of Ottawa, INC | Educational Services | $384,450 | $387,013 | 54 | N/A | Research |
| Marquette Academy of Ottawa, INC | Educational Services | $384,400 | $386,781 | 54 | N/A | Research |
| Ottawa Plant Food, INC | Wholesale Trade | $362,500 | $364,685 | 26 | $6.7M | Research |
| Red's Truck Repair INC | Other Services (except Public Administration) | $337,500 | $340,041 | 21 | <$5M | Research |
| B.a.s.h. LLC | Accommodation and Food Services | $331,408 | $334,223 | 65 | $11.5M | Research |
| Drop Tank, LLC | Professional, Scientific, and Technical Services | $326,300 | $328,023 | 29 | <$5M | Research |
| Burns Machine Company | Manufacturing | $320,988 | $323,107 | 27 | $6.6M | Research |