Thousands joined together over the four-day weekend to mark Her Majesty's milestone.
Over the last seven decades, Her Royal Majesty has represented the United Kingdom and the Commonwealth in countless countries across the global, whilst also visiting numerous places in and around England.
Below we look back at her various visits to the county:
Queen Elizabeth II receiving a bouquet from Crystal Harrison on her visit to Messrs. Harrison and Sons works, Hughenden Avenue, High Wycombe. 10 Nov 1952
The Mayor presents Queen Elizabeth II with a Casket as a memento of her visit. Queen Victoria Road, High Wycombe. April 1962
Queen Elizabeth II with the Headmaster enters the Royal Grammar School Complex, Amersham Rd, High Wycombe. April 1962
Queen Elizabeth II views locally-made furniture on her visit to the Town Hall, Queen Victoria Road, High Wycombe. April 1962
The photos - which can all be viewed online thanks to swop.org.uk - were taken on two different occasions.
Queen Elizabeth II views a display of furniture and tapestries associated with the town on her visit to the Town Hall, Queen Victoria Road, High Wycombe. April 1962
Some of the photos document the monarch's first ever visit to High Wycombe, on November 10, 1952.
Queen Elizabeth II viewing work on enlarged master stamp artwork on her visit to Messrs. Harrison and Sons works, Hughenden Avenue, High Wycombe
She was visiting the stamp factory of Harrison and Sons in Hughenden Avenue to look at the stamps that were being produced to commemorate her coronation in June 1953.
The Royal visited again in April 1962, where she spent eight hours touring South Bucks.
Queen Elizabeth II meets senior Town Councillors at the Town Hall, Queen Victoria Road, High Wycombe. April 1962
Queen Elizabeth II meets John Hall MP and other dignitaries on her visit to the Town Hall, Queen Victoria Road, High Wycombe. April 1962
This included a visit to Royal Grammar School in Amersham Road and the Town Hall.
Queen Elizabeth II is presented to education officers, the Head-master and Head-boy at the Royal Grammar School, Amersham Road High Wycombe. April 1962
The Queen visited High Wycombe again in May 1972 with another visit to the Harrison's factory.
Queen Elizabeth II is greeted by the Lord Lieutenant of Bucks on her visit to the Town Hall, Queen Victoria Road, High Wycombe.
She also returned in October 1974 when she was given a tour of the National Sports Centre at Bisham Abbey.
Queen Elizabeth II inspecting the Royal Green Jackets Guard of Honour in Queen Victoria Road, High Wycombe. April 1962
Her first recorded visit to South Bucks was as a seven-year-old Princess - she visited Bekonscot model village in Beaconsfield a day before her eighth birthday.
Queen Elizabeth II in conversation with Mayor Ward on her visit to Messrs. Harrison and Sons works, Hughenden Avenue, High Wycombe
Queen Elizabeth II being presented to local Dignitaries Outside the Town Hall, Queen Victoria Road, High Wycombe. April 1962
Part of a crowd waving Union Jack flags, probably on the occasion of the visit of Queen Elizabeth II in 1962. Queen Victoria Rod, High Wycombe
Crystal Harrison presents a bouquet to the Queen on her visit to Harrison and Sons stamp factory, Hughenden Avenue, High Wycombe
Queen Elizabeth II in conversation with Mayor Ward on her visit to Messrs. Harrison and Sons works, Hughenden Ave, High Wycombe
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