- Audi of Alexandria
- Audience Response Systems, Inc.
- Audrain Medical Center
- Audubon County Memorial Hospital
- Augusta Aviation, Incorporated
- Augusta Health
- Augusta Metropolitan Convention and Visitors Bureau
- Augusta Richmond County Public Library System
- Augusta University Medical Center
- Augustana College
- AUI, Inc.
- Aultman Hospital
- Aultman Orrville Hospital
- Aurium Consulting, LLC
- Auro Hotels
- Aurora BayCare Medical Center
- Aurora Health Care
- Aurora Lakeland Medical Center
- Aurora Medical Center in Burlington
- Aurora Medical Center in Grafton
- Aurora Medical Center in Kenosha
- Aurora Medical Center in Manitowoc County
- Aurora Medical Center in Oshkosh
- Aurora Medical Center in Summit
- Aurora Medical Center in Washington County
- Aurora Ministries
- Aurora Rotary Club
- Aurora Sheboygan Memorial Medical Center
- Aurora Sinai Medical Center
- Aurora St. Luke's Medical Center
- Aurora St. Luke's Medical Center South Shore
- Aurora West Allis Medical Center
- Austin Brockenbrough and Associates. L.L.P.
- Austin Commercial Contractors LP
- Austin Convention and Visitors Bureau
- Austin Marriott North, Round Rock
- Auto Collision Works
- Automated Graphic Systems
- Automatic Data Processing, Inc.
- Automation Systems and Control
- Automobile Club of Southern California
- Automotive Recyclers Association
- AutoNation
- Autoville ASP, Inc.
- AutoZone
- Availa Bank Carroll
- Avanco International, Inc.
- Avantec
- Aventis
- Aventura Hospital and Medical Center