| The Monmouth College | Educational Services | $2,705,290 | $2,736,864 | 304 | N/A |  Research |
| The Monmouth College | Educational Services | $2,000,000 | $2,017,788 | 254 | N/A | Research |
| Jenks Family Farms | Agriculture, Forestry, Fishing and Hunting | $404,668 | $408,422 | 39 | <$5M | Research |
| Western Illinois Home Health Care, INC | Health Care and Social Assistance | $320,400 | $323,973 | 28 | <$5M | Research |
| Axline's Inc. | Retail Trade | $310,000 | $311,809 | 44 | $7.7M | Research |
| Jenks Family Farms | Agriculture, Forestry, Fishing and Hunting | $300,715 | $301,876 | 27 | <$5M | Research |
| Nik INC of Monmouth | Accommodation and Food Services | $255,500 | $257,232 | 48 | $8.5M | Research |
| Robbins Resource Management | Manufacturing | $237,628 | $238,943 | 22 | $21.8M | Research |
| Immaculate Conception Roman Catholic Congregation of Monmout | Other Services (except Public Administration) | $200,907 | $202,330 | 32 | N/A | Research |
| Immaculate Conception Roman Catholic Congregation of Monmout | Other Services (except Public Administration) | $198,585 | $200,163 | 57 | N/A | Research |
| Bruce Foote Chevrolet INC | Retail Trade | $192,870 | $194,242 | 16 | <$5M | Research |
| Bruce Foote Chevrolet INC | Retail Trade | $186,862 | $176,109 | 14 | <$5M | Research |
| Kunes Country of Monmouth, Inc. | Retail Trade | $165,700 | $167,330 | 25 | $6.3M | Research |
| Painter Farm Equipment INC | Wholesale Trade | $153,431 | $154,394 | 12 | <$5M | Research |
| Ymca of Warren County | Other Services (except Public Administration) | $140,610 | $141,026 | 60 | N/A | Research |
| Ymca of Warren County | Other Services (except Public Administration) | $139,942 | $141,456 | 70 | N/A | Research |
| Bernardi Brothers III Inc. | Accommodation and Food Services | $129,500 | $130,158 | 10 | <$5M | Research |
| Halcomb Oil Company | Wholesale Trade | $120,550 | $121,334 | 12 | <$5M | Research |
| Halcomb Oil Co. | Wholesale Trade | $120,077 | $120,764 | 12 | <$5M | Research |
| Novamed Alliance Inc. | Wholesale Trade | $113,750 | $113,959 | 9 | <$5M | Research |
| Advanced Plumbing & Mechanical, LLC | Construction | $108,340 | $108,957 | 10 | <$5M | Research |
| Cavanaugh Davies Blackman & Cramblet | Professional, Scientific, and Technical Services | $97,115 | $97,379 | 8 | <$5M | Research |
| Jbf Trucking LLC | Transportation and Warehousing | $95,253 | $95,629 | 13 | <$5M | Research |
| Parkins Trucking LLC | Transportation and Warehousing | $93,266 | $93,784 | 10 | <$5M | Research |
| Bernardi Brothers Iii, INC | Accommodation and Food Services | $92,500 | $93,199 | 10 | <$5M | Research |