Major Employers
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| Company | Industry | Employees |
|---|---|---|
| Fort Detrick Campus | Army, NCI, and other tenants | 10,827 |
| Frederick County Public Schools | Public Education | 7,433 |
| Frederick Health | Comprehensive Health Care | 3,360 |
| Frederick County Government | County Government | 2,810 |
| Leidos Biomed / Frederick National Lab | Medical Research | 2,440 |
| Frederick Community College | Public Two-Year College | 1,369 |
| City of Frederick Government | Municipal Government | 977 |
| ThermoFisher Scientific | Life Sciences Research | 815 |
| AstraZeneca | Biotech Manufacturing | 799 |
| Costco Wholesale | Wholesale Distribution Center and E-commerce Center | 725 |
| Mount Saint Mary’s University | Private Four-Year University | 682 |
| Legal & General America | Life Insurance Headquarters | 638 |
| NVR, Inc. | Home Building and Mortgage Banking | 630 |
| ALDI Distribution Center and Retail | Retail Supermarket and Distribution | 552 |
| STULZ Air Technology Systems, Inc. | Manufacturer, Commercial Air Conditioners and Dehumidifiers | 536 |
| Lonza | Biological Products | 517 |
| Kite, a Gilead Company | Cell Therapy Products | 510 |
| YMCA of Frederick County | Recreation and Sports Center | 509 |
| National Emergency Training Center | US Fire Academy, FEMA, and other tenants | 400 |
| Music & Arts | Music Retailer and Headquarters (a Subsidiary of Guitar Center) | 396 |
| Plamondon Hospitality Companies | Hospitality (Hotels, Restaurants, and Restaurant Management) | 390 |
| Sheppard Pratt | Outpatient Mental Health | 376 |
| Pleasants Construction, Inc. | Construction and Paving | 360 |
| RR Donnelley | Business Documents | 350 |
| Fitzgerald Auto Mall Frederick | Auto Dealership | 347 |
| Maryland School for the Deaf | Educational Institution | 320 |
| Cian Diagnostics | Diagnostic Testing | 307 |
| R.W. Warner | Construction/Trade Contractor | 302 |
| Homewood Living Ministries | Retirement Community | 300 |
| Wright Manufacturing | Lawn Maintenance Technology | 280 |
| Morgan-Keller Construction | General Contractors | 253 |
| Hood College | Private Four-Year College | 251 |
Fort Detrick Campus includes military personnel, contractors, and an offsite annex.