Despite the Blues’ season being all but over after missing out on the play-offs, 3,120 supporters made the trip to Pride Park for the final away fixture of the campaign.
The Fratton faithful’s magnificent following helped John Mousinho’s men to a 1-1 draw against promotion-chasing Derby.
In fact, the fixture was the second-most watched contest in League One this season with 31,744 in attendance.
But how does the Blues support compare across the EFL?
We’ve taken a look at the highest away followings from across the Football League last weekend to discover where Pompey’s figures rank.
5. Port Vale fans at Charlton - The Valley
Away attendance: 996; Overall attendance: 15,314. Photo: Morgan Harlow
6. Oxford United fans at Forest Green - New Lawn
Away attendance: 1,224; Overall attendance: 4,070. Photo: Catherine Ivill
7. Millwall fans at Blackpool - Bloomfield Road
Away attendance: 1,249; Overall attendance: 12,191. Photo: Ashley Allen
8. Stockport fans at Leyton Orient - Brisbane Road
Away attendance: 1,250; Overall attendance: N/A. Photo: Charlotte Tattersall