American Citizens Abroad ( ACA ) is a non-profit , non-partisan advocacy organization headquartered in Geneva , Switzerland , working on behalf of the estimated three to six million United States citizens living outside the U.S. , who have no designated governmental focal point in Washington .
American Citizens Abroad ( ACA ) is a non-profit , non-partisan advocacy organization headquartered in Geneva , Switzerland . 
 It works on behalf of the estimated three - to - six million United States citizens living outside the country who have no designated governmental focal point in Washington .