| A-1 Graphics, Inc. | 2500 W. 7th St. | Muncie | (765) 289-1851 | Website | Die-Cut Paper and Paperboard and Cardboard; Commercial Printing, Lithographic; Bookbinding and Related Work; Typesetting |
| Abby Candles | 4201 N. Old State Rd. 3 | Muncie | (765) 282-3594 | Website | Manufacturing Industries, NEC |
| ABF Freight Systems, Inc. | 3921 Cowan Rd. | Muncie | (765) 288-9225 | Website | Trucking, Except Local |
| Academy of Model Aeronautics | 5161 E. Memorial Dr. | Muncie | (765) 287-1256 | Website | Personal interest organization; membership recreation club; publisher |
| Ace Sign Systems, Inc. | 3621 W. Royerton Rd. | Muncie | (765) 288-1000 | Website | Manufactures signs & advertising specialties |
| Advance Tool & Die, Inc. | 1700 S. Nebo Rd. | Yorktown | (765) 284-7653 | | Machine shop, general machining, tool & die |
| Advanced Coatings & Metallizing Engineering | 1301 E. Washington St. | Muncie | (765) 289-6515 | | Protective coatings & high performance coatings; thermal spray & powder coatings; fabrication |
| Advanced Roofing Systems, Inc. | 1924 N. Elm St. | Muncie | (765) 288-8881 | Website | Roofing, Siding, and Sheet Metal Work |
| Advanced Signs & Graphics | 3939 E. McGalliard Rd. | Muncie | (765) 284-8360 | Website | Manufactures signs & advertising specialties |
| Advanced Stamping Technologies | 1435 S. Kinney Ave. | Muncie | (765) 289-8853 | | Manufactures tools, dies, jigs & fixtures |
| AEM Inc. | 3621 S. Ebright St. | Muncie | (765) 282-4843 | | Millwright; electrical contractor; manufactures electrical soldering equipment |
| AFTCO Manufacturing | 9801 W. Jackson St. | Yorktown | (765) 759-5161 | | Tools, dies, & metal forgings |
| Agbest Co-Op, Inc. (HQ) | 2101 N. Granville Ave. | Muncie | (765) 288-5001 | Website | Prepared Feed and Feed Ingredients for Animals and Fowls, Except Dogs and Cats |
| All Steel Carports, Inc. | 908 S. Mound St. Ste. 3 | Muncie | (765) 284-0694 | Website | Manufactures portable prefabricated metal buildings |
| Allied Enterprises, Inc. | 3228 W. Kilgore Ave. | Muncie | (765) 288-8849 | | Manufactures off-road transmission parts |
| Alpha Graphics Ltd. | 3808 N. Wheeling | Muncie | (765) 282-9588 | Website | Automotive Trimmings, Apparel Findings, and Related Products; Commercial Printing, Lithographic; Marking Devices; Signs and Advertising Specialties |
| Alro Steel Corporation | 2301 S. Walnut St. | Muncie | (765) 282-5335 | Website | Metal service center, metal cutting & shearing |
| American Design & Engineering Co. | 3000 S. Hackley St. | Muncie | (765) 288-8886 | Website | Manufactures stamped automotive products, broaches, wire & wire products; tube fabricator |
| American Lawn Mower Company (HQ) | 2100 N. Granville | Muncie | (765) 288-6624 | Website | Manufactures residential hand or power lawnmowers |
| American Mobile Sound Indiana | 120 N. Mulberry St. | Muncie | (765) 288-3548 | | Manufactures amplifiers |
| Area Plastics | 1151 N. Hartford St. | Eaton | (765) 396-4440 | | Manufactures plastic products |
| Arrowhead Plastic Engineering, Inc. | 1155 N. Hartford St. | Eaton | (765) 396-9113 | Website | Wholesales plastic materials; manufactures thermoformed plastic products |
| Arrowhead Plastic Engineering, Inc. (HQ) | 2909 S. Hoyt | Muncie | (765) 286-0533 | Website | Manufactures processed plastics |
| Artisan Tool & Die, Inc. | 3805 W. State Rd. 28 | Muncie | (765) 288-6653 | Website | Manufactures industrial molds |