Teams
Current
- Bradford Bulls
- Castleford Tigers
- Halifax Panthers
- Leeds Rhinos
- London Broncos
- Oldham
- St Helens
- Sheffield Eagles
- Warrington Wolves
- Wigan Warriors
- Workington Town
Former
- Aberdare
- Acton and Willesden
- Altrincham
- Barrow Raiders
- Barry
- Batley Bulldogs
- Belle Vue Rangers
- Birkenhead Wanderers
- Blackpool Gladiators
- Bramley
- Brighouse Rangers
- Cardiff
- Carlisle
- Carlisle (1928/29)
- Castleford
- Coventry
- Dewsbury Rams
- Doncaster RLFC
- Ebbw Vale
- Featherstone Rovers
- Goole
- Heckmondwike
- Holbeck
- Huddersfield Giants
- Hull FC
- Hull Kingston Rovers
- Hunslet RLFC
- Keighley Cougars
- Lancaster
- Leeds Parish Church
- Leigh Leopards
- Liverpool City
- Liversedge
- Manningham
- Merthyr Tydfil
- Mid Rhondda
- Millom
- Morecambe
- Newcastle (UK)
- Normanton
- Pilkington Recreation
- Pontefract
- Pontypridd
- Prescot Panthers
- Radcliffe Rangers
- Rochdale Hornets
- Runcorn
- Salford RLFC
- Sowerby Bridge
- Stockport
- Streatham and Mitcham
- Swinton Lions
- Treherbert
- Tyldesley
- Wakefield Trinity
- Whitehaven RLFC
- Widnes Vikings
- York Knights