The Wearsiders were promoted to the Championship via the play-offs after beating Wycombe 2-0 at Wembley, courtesy of goals from Elliot Embleton and Ross Stewart.
And despite being in the third tier, Sunderland’s attendances have still surpassed many crowds at Premier League grounds.
We’ve taken a closer look at the top 25 English clubs who have recorded the highest attendance figures this season – including play-off matches.
Here is where Sunderland rank and how they compare to other clubs on the list.
1. (25th) Ipswich - Portman Road
League One | Average attendance: 21,779
Photo: Harry Engels
2. (24th) Middlesbrough - Riverside Stadium
Championship | Average attendance: 21,921
Photo: George Wood
3. (23rd) West Brom - The Hawthorns
Championship | Average attendance: 22,222
Photo: Shaun Botterill
4. (22nd) Sheffield Wednesday - Hillsborough
League One | Average attendance: 22,908
Photo: George Wood