Sussex 3 (1987–1992) The original Sussex 3 was a tier 10 league with promotion up to
Sussex 1 and there was no relegation down as it was the lowest level of the league system. The division was cancelled at the end of the 1991–92 season.
Sussex 3 (1994-1996) After an absence of two years, Sussex 3 was reintroduced for the 1994–95 season as a tier 11 league. Promotion was to
Sussex 2 and there was no relegation due to Sussex 3 being the lowest level in the league system.
Sussex 3 (1996-2000) The cancellation of
National 5 South at the end of the 1995–96 season meant that Sussex 3 reverted to being a tier 10 league. Promotion continued to
Sussex 2 and there was no relegation. Sussex 3 was cancelled for the second time at the end of the 1999–00 season, with the majority of teams transferred into the new Sussex 2 East or Sussex 2 West (formerly a single Sussex 2 division).
Sussex 3 (2002-2004) After an absence of two years, Sussex 3 returned for the 2002–03 season, now as a tier 11 league. Promotion was to
Sussex 2 and there was no relegation. After just two seasons, Sussex 3 was cancelled for the third time in its history.
Sussex 2 East / Sussex 2 West (2010–2016) Sussex 3 was reintroduced for the 2010–11 season in the form of two regional divisions - Sussex "Asahi" 2 East and Sussex "Oranjeboom" 2 West - both sitting at tier 11 of the league system. Promotion was to
Sussex Canterbury Jack Intermediate (renamed back to Sussex 2 for the 2015–16 season onward) and relegation to either
Sussex 3 East or
Sussex 3 West.
Sussex 3 (2016–onward) For the 2016–17 season, Sussex 3 was remerged back into a single division at tier 11 of the league system. Promotion was to
Sussex 2 and relegation to
Sussex 4. ==Number of league titles==