On June 10, 1939, King George VI and Queen Elizabeth of England visited Monmouth County as part of a visit to the U.S., the first by any English monarch in history. The Royals began their trip in Washington D.C., then the royal couple took a train to Red Bank, and from there a motorcade to Sandy Hook, and then a boat across the harbor to New York to visit the World’s Fair. Newspaper accounts of the day said 200,000 people lined the route of the motorcade through Monmouth County.
Source: https://www.nytimes.com/1976/04/17/archives/red-bank-hopes-to-recreate-royal-visit.html