Bucks/Oxon 1 (1987–1993) Originally known as Bucks/Oxon 1, it was a level 8 league for clubs based in
Buckinghamshire and
Oxfordshire. Promotion was to
Southern Counties and relegation to
Bucks/Oxon 2.
Bucks/Oxon 1 (1993–1996) The creation of
National League 5 South for the 1993–94 season meant that Bucks/Oxon 1 dropped to become a tier 9 league. Promotion continued to
Southern Counties and relegation to
Bucks/Oxon 2.
Bucks/Oxon (1996–1997) The cancellation of
National League 5 South at the end of the 1995–96 season saw Bucks/Oxon 1 renamed as Bucks/Oxon and once more was a tier 8 league. Further restructuring meant that promotion was now to
Southern Counties North and relegation was to
Bucks/Oxon 2.
Bucks/Oxon 1 (1997–1999) Bucks/Oxon would revert to its former name of Bucks/Oxon 1 for the 1997–98 season, remaining a tier 8 league. Promotion continued to
Southern Counties North and relegation to
Bucks/Oxon 2 Bucks/Oxon (1999–2000) Once again Bucks/Oxon 1 became a single league known as Bucks/Oxon, remaining at tier 8. Promotion continued to
Southern Counties North, while relegation would be to the new
Berks/Bucks & Oxon 2.
Berks/Bucks & Oxon 1 (2000–2004) Restructuring ahead of the 2000–01 season would see
Berkshire based clubs join the Bucks & Oxon leagues. This meant that Bucks/Oxon 1 would be renamed Berks/Bucks & Oxon 1, remaining a tier 8 league. Promotion would continue to
Southern Counties North, while relegation was to
Berks/Bucks & Oxon 2.
Berks/Bucks & Oxon (2004–2009) Ahead of the 2004–05 season Berks/Bucks & Oxon 1 was renamed to Berks/Bucks & Oxon Premier, remaining a tier 8 league. Promotion continued to
Southern Counties North and relegation was now to
Berks/Bucks & Oxon 1 (formerly
Berks/Bucks & Oxon 2).
Berks/Bucks & Oxon Premier (2009–present) Despite widespread restructuring by the
RFU at the end of the 2008–09 season, Berks/Bucks & Oxon Premier remained a tier 8 league, with promotion continuing to
Southern Counties South and relegation to the newly introduced
Berks/Bucks & Oxon Championship (last known as Berks/Bucks & Oxon 2). ==Number of league titles==