The Phi Delta Phi membership exceeds 191,00 persons. More judges, American Presidents, governors, senators, representatives, cabinet members, ambassadors, American Bar Association Presidents, Association of American Law School Presidents and law school Deans are from the ranks of Phi Delta Phi than any other legal fraternity.

American presidents, Supreme Court Justices and prominent members of the bar and bench who have been initiated into Phi Delta Phi include:

Howard Baker, Jr. - James A. Baker, III - Birch E. Bayh - Hugo Black - Robert H. Bork - William J. Brennan - Ellen Burns - Benjamin N. Cardozo - Pamela Carter - Archibald Cox - Gerald R. Ford - Joyce Hens Green - Charles Evans Hughes - Daniel K. Inouye - Henry M. Jackson - Thomas Penfield Jackson - Leon Jaworski - Anthony M. Kennedy - Robert F. Kennedy - Karl Lllewllyn - Thurgood Marshall - William McKinley - Gerald T. McLaughlin - Edwin Meese, III - Walter Mondale - Malcom W. Monroe - Sandra Day O'Connor - R. Thomas Olson - Samuel Pierce, Jr. - Lewis F. Powell, Jr. - William L. Prosser - Dana Rasmussen - Sam Rayburn - William H. Rehnquist - Stephen R. Reinhardt - Owen J. Roberts - Franklin D. Roosevelt - Theodore Roosevelt - Antonin Scalia - Myra C. Selby - William French Smith - John Paul Stevens - Adlai Stevenson - Potter Stewart - William H. Taft - Earl Warren - Byron R. White - Wendell Willkie