| Business Name | Product/service | Employees |
|---|---|---|
| Adams 12 Five Star Schools | K-12 Education | 4,400 (entire district, not Thornton only) |
| City of Thornton | City Government | 963 |
| North Suburban Medical Center | Full-Service Hospital | 850 |
| WalMart Stores | Retail Trade | 737 |
| King Soopers | Grocery Stores | 503 |
| Appliance Factory Outlet | Distribution | 500 |
| American Furniture Warehouse | Retail Trade | 450 |
| Dish Network | Satellite TV & Equipment | 400 |
| The Home Depot | Retail Trade | 320 |
| Avaya, Inc. | Telecommunications | 310 |
| Safeway Stores | Grocery Stores | 308 |
| AMI Mechanical | Commercial Mechanical Contractor | 289 |
| Cabela's | Outdoor Recreation Retail | 250 |
| Vibra Hospital | Rehabilitation & Long-Term Acute Care | 241 |
| Centura Health - Villas at Sunny Acres | Healthcare & Assisted Living | 231 |
| McDonald's | Food Services | 231 |
| Sam's Club | Retail Trade | 230 |
| Peak Medical of Colorado | Skilled Nursing & Rehabilitation Center | 224 |
| Costco | Retail Trade | 222 |
| Allied Global - Marketlink | Call Center for Telecommunications Companies | 200 |
| Rocksol Consulting Group, Inc | Engineering & Testing | 200 |
| Sungard Network Solutions Inc | Information Technology | 200 |
| Google Inc | Information Technology | 160 |
| Target Corporation | Retail Trade | 160 |
| Alpine Living Center | Senior Living Center | 145 |
| Rangeview Library District | Library | 144 |
| Sears | Retail Trade | 135 |
| All Valley Home Care | In-Home Healthcare Services | 130 |
| Buffalo Wild Wings | Food Services | 130 |
| Kohls Department Store | Retail Trade | 130 |
| Sun Enterprises, Inc | Retail Trade | 125 |
| Old Chicago | Food Services | 120 |
| Cheddar's Scratch Kitchen | Food Services | 115 |
| Allegro Coffee Company | Coffee Roasting & Distribution | 113 |
| Ascent Solar Technologies Inc | Thin Film Solar Panel Manufacturer | 113 |
| Olive Garden Italian Restaurant | Food Services | 110 |
| Famous Dave's | Food Services | 105 |
| Golden Corral Buffet | Food Services | 105 |
| Grand Auto, Inc | Auto Dealership | 102 |
| Dynamic Metal Fabrication Inc | Metal Fabrication | 93 |
| Mi Pueblo Market | Grocery Store | 100 |
| Sonder | Call Center | 100 |
| TGI Fridays | Food Services | 100 |
| Arapahoe House | Rehabilitation Treatment | 99 |
| Walgreens | Retail Trade | 99 |
| Chick-fil-A | Food Services | 91 |
| Pro Chrysler Jeep | Auto Dealership | 91 |
| Advanced Systems Group | Information Technology | 90 |
| Intrex Aerospace | Metal Fabrication | 90 |
| Enterprise Holdings, Inc. | Passenger and Rental Car Sales - Corporate Location | 80 |
| The Northern Group | National Electrical Contractor | 60 |
| Hensel Phelps | Construction | 50 |
| Alliance Construction Solutions | Construction | 40 |
| Sonder | Hospitality Back Office | 36 |
| Adams Polishes | Polish & Other Sanitation Goods Manufacturing | 35 |
| Tower Engineering | Engineering Services - Telecom Cell Towers | 35 |
| Newcomb Spring of Colorado | Precision Spring Manufacturer | 30 |
| RMD Kwikform | Formwork & False Work Manufacturer - Construction | 30 |
| Employers Edge | Unemployment Benefit Management | 35 |
| Taylor Kohrs | Construction | 25 |
| Onesource Magazine Dist LLC | Business Information Services | 20 |
The Summit Entertainment - Opening February 2019.
