I’m talking about attendances pre all seater stadium days, Ipswich’s record attendance is 38000+
A good portion of Suffolk would probably see Norwich as their local team. We have the entirety of Warwickshire where we’re the closest big team, as well as being a large city on top of that. We’re surrounded by decent sized towns that are literally 10 minute drive away, although I concede we have to contend with numerous big clubs for support (Leicester, Brum, Villa etc.,)
Ipswich is isolated away from Suffolks largest towns (Lowestoft the largest being more local to Norwich), and is far for most away support too, whereas we benefit from being in the middle of the country and easy to travel to.