| Arc of Washington County, Inc. | Health Care and Social Assistance | $4,353,800 | $4,404,018 | 500 | N/A |  Research |
| Kr Contracting, INC | Administrative and Support and Waste Management | $2,957,857 | $2,992,298 | 366 | $53.6M | Research |
| Brethren Mutual Insurance Company | Finance and Insurance | $2,730,900 | $2,782,941 | 142 | $73.0M | Research |
| C. William Hetzer, Inc. | Manufacturing | $2,628,080 | $2,630,189 | 245 | $243.0M | Research |
| Smith Elliott Kearns & Company, LLC | Professional, Scientific, and Technical Services | $2,607,115 | $2,486,603 | 197 | $62.7M | Research |
| Direct Mail Processors INC | Administrative and Support and Waste Management | $2,201,870 | $2,226,274 | 485 | $91.7M | Research |
| Jamison Door Company | Manufacturing | $2,137,400 | $2,161,643 | 143 | $35.0M | Research |
| Hospice of Washington County, Inc. | Health Care and Social Assistance | $2,058,100 | $2,102,081 | 160 | N/A | Research |
| Hbp INC | Manufacturing | $2,051,262 | $2,075,193 | 137 | $135.9M | Research |
| Hbp INC | Manufacturing | $2,000,000 | $2,020,778 | 115 | $114.1M | Research |
| Marvatemp INC | Administrative and Support and Waste Management | $1,893,255 | $1,914,729 | 274 | $43.1M | Research |
| Parkway Neuroscience and Spine Institute | Health Care and Social Assistance | $1,861,000 | $1,881,988 | 73 | $22.9M | Research |
| Ellsworth Electric, Inc. | Construction | $1,845,000 | $1,855,353 | 112 | $36.8M | Research |
| Lanco Dairy Farms Co-Op, Inc. | Manufacturing | $1,841,459 | $1,855,218 | 123 | $43.4M | Research |
| Marvatemp INC | Administrative and Support and Waste Management | $1,784,432 | $1,798,610 | 292 | $46.0M | Research |
| King Hagerstown Motors LLC | Retail Trade | $1,724,666 | $1,734,918 | 115 | $29.0M | Research |
| Optimal Health Care INC | Health Care and Social Assistance | $1,573,399 | $1,588,434 | 243 | $41.6M | Research |
| Younger Motorcars, Inc. | Retail Trade | $1,540,012 | $1,556,610 | 126 | $31.8M | Research |
| Younger Motorcars INC | Retail Trade | $1,540,012 | $1,550,792 | 205 | $51.7M | Research |
| Optimal Health Care INC | Health Care and Social Assistance | $1,530,800 | $1,541,941 | 241 | $41.3M | Research |
| S&s Wva Enterprises LP | Accommodation and Food Services | $1,469,000 | $1,484,057 | 493 | $87.5M | Research |
| Stan and Sandy Enterprises, LP | Accommodation and Food Services | $1,442,400 | $1,453,739 | 450 | $79.9M | Research |
| Wilson, Inc. | Retail Trade | $1,327,300 | $1,340,204 | 102 | $25.7M | Research |
| Meritus Enterprises Inc. | Other Services (except Public Administration) | $1,293,050 | $1,300,915 | 119 | $22.7M | Research |
| Potomac Case Management Services INC | Health Care and Social Assistance | $1,141,100 | $1,153,715 | 111 | N/A | Research |