Waubonsee Community College 805 A 2-year public college with 10,000 students enrolled.
Jewel-Osco 150 One of a chain of more than 180 grocery stores in Illinois, Iowa and Indiana.
Harter Middle School 120 Public Middle School. District 302
John Shields Elementary School 85 Public Elementary School.  District 302
Esterline – CMC Electronics, Inc. 82 Aviation electronics & components manufacturer.
J. A. Air Inc. 78 Aircraft Dealer, Aircraft Parts, Fixed Base Operator.
Culver’s 70 Restaurant
Quantum Signs 65 Manufacturing of signs and advertising displays and specialties.
McDonald’s 60 Restaurant
Sugar Grove Fire Department 60 Public Safety
HFR Precision Machining 60 Contract manufacturing machine shop
Village of Sugar Grove 55 Municipal Government and Police Department
ISR Inc 52 Custom tailored, unified systems solutions that enable clients to easily manage their luxury homes and commercial facilities.
Scot Industries Inc.
Specialty tubing and bar products (honed steel tubing, chrome plating)
Fireside Grille 50 Full-Service Restaurant.
Midway Industrial Equipment 43 Industrial Machinery and Equipment Merchant Wholesalers.
Engineering Enterprises Inc. 41 Civil Engineering & Surveying Services
Rich Harvest Links Golf Course 40 Golf Course and Country Club.
Sunbelt Rentals 40 Industrial and construction equipment rental.
Producers Chemical 32 Chemical and Allied Products Merchant Wholesalers
Aerocare Medical Transport/R & M Aviation 25 Air Ambulance Service.
Re/Max All Professional 25 Real Estate Agents and Brokers
Air Classics Museum Library 23 Aircraft Museum
Sugar Grove Public Library 23 Public Library
Hy-Tek Manufacturing 23 Design and Manufacturing of machining assembly products and solutionsBottom of Form.
Deep-Coat Metallizing 21 EMI shielding for  board level shields for the military to coating large molded medical enclosures, fiber optic & electronic connectors, instrument cases & communications equipment.
Walgreens 21 Retail sale of prescription drugs, proprietary drugs, and non-prescription medicines.
Falex 21 Petroleum and tribology testing equipment and services for the evaluation of the physical properties of fuels, lubricants, and materials.
Lumanair Aviation Services 20 Aircraft servicing, parts; hangar, office space rental; flight training, FAA testing, pilot supplies, aircraft sales and fuel services. Fixed Base Operator.
Executive Flight Management 20 Air Transportation Equipment Rental and Leasing.
Finishes Unlimited Inc. 20 Industrial Coatings manufacturing, including waterborne, air dry and bake enamel.
Jimmy John’s 20 Fast Food Restaurant.