Chicago, Illinois, United States

The American Medical Association, Accreditation Council for Graduate Medical Education, Accreditation Council for Continuing Medical Education, American Osteopathic Association, American Dental Association, Academy of General Dentistry, American Dietetic Association, American Association of Nurse Anesthetists, American College of Surgeons, American Society for Clinical Pathology, American College of Healthcare Executives and the American Hospital Association, and Blue Cross and Blue Shield Association are all based in Chicago.
Sister cities
Chicago has 28 Sister Cities around the world. Like Chicago, many of them are or were the second most populous city or second most influential city of their country, or they are the main city of a country that has had large amounts of immigrants settle in Chicago. Paris is a Partner City, due to the one sister city policy of its respective French commune.