Note that due to the varying inclusion and non-inclusion of a playoff system within the competition, the team that finished first in regular season have not always been champions.

After concerns around travel and costs were expressed, the decision was made that the competition should be split into two separate county championships: Lancashire and Yorkshire Leagues.

Part of the deal was switching the sport to summer and the merger of some clubs, the latter not taking place due to huge protest from fans.

All four Super League champions; St Helens, Wigan, Bradford and Leeds have all previously won the old First Division.

Hunslet FC were the fourth former champions to fold after financial issues [1], player strikes and a stadium fire that led to the club selling the land to developers before being eventually wound up.

Four clubs have finished runners up without ever winning a Championship: Castleford Tigers (1938–39, 1968–69, 2017), Catalans Dragons (2021, 2023), London Broncos (1997) and the now defunct St Helens Recs (1926–27).

Of the current top flight teams Warrington are waiting the longest for their next title having last won it in 1955; 70 years ago (1955).