When you look at raw attendance figures they can be misleading when expressing the importance of the club to its community. A different but not necessarily better guide is the percentage of the population from each clubs catchment area that regularly attends games. This is not overly scientific and there are lots of other factors coming into play. Most obvious being the recent success of each club, its facilities and competition from other sports in that area. All the same, it's interesting, the most dramatic being Leeds at the bottom, not that most clubs wouldn’t kill for those figures.
I’ve left out London because it's not fair to compare them to anyone and Catalan because they are SL’s only regional club and thus it's hard to pin down their exact catchment area.
These are not super accurate figures but close enough, I've rounded them up to the nearest 0.5%. Apologies if I've made any huge errors, I'm sure they will be corrected.
2019 SL Figures by attendance
St Helens 11,910
Leeds Rhinos 11,838
Hull FC 11,478
Wigan Warriors 11,432
Warrington Wolves 10,970
Hull KR 8,185
Castleford Tigers 7,253
Wakefield Trinity 5,468
Huddersfield Giants 5,222
Salford 3,676
2019 SL Figures by the percentage of the population
Average Population Percentage
Castleford Tigers 7,253 40,210 18%
St Helens 11,910 102,629 11.5%
Wigan Warriors 11,432 103,608 11%
Hull FC 11,478 130,248 (50%) 9%
Hull KR 8,185 130,248 (50%) 6.5%
Wakefield Trinity 5,468 99,251 6%
Warrington Wolves 10,970 209,547 5%
Huddersfield Giants 5,222 162,949 3.5%
Salford 3,676 103,886 3.5%
Leeds Rhinos 11,838 789,194 1.5%