The American Chiropractic Association (ACA), based in Arlington, VA, is the largest professional association in the world representing doctors of chiropractic. The ACA provides lobbying, public relations, professional and educational opportunities for doctors of chiropractic, funds research regarding chiropractic and health issues, and offers leadership for the advancement of the profession. With approximately 15,000 members, the ACA promotes the highest standards of ethics and patient care, contributing to the health and well-being of millions of chiropractic patients. Click here for a list of membership benefits.