The data includes high street, hospitality and office workers based the town centre.
However, an expert at the think-tank said they were unable to differentiate between the sectors that workers returning to the city centre were employed in.
Paul Clement, chief executive of Ipswich Central business improvement district, said the Centre for Cities study was incredibly surprising and incredibly disturbing .
Paul Clement, chief executive of Ipswich Central
- Credit: Archant Certainly most of the offices that are part of the business improvement district (BID) are beginning now to return people to their desks, albeit on a sort of part time hybrid basis.
Ipswich: Workers have still not returned to town centre
ipswichstar.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from ipswichstar.co.uk Daily Mail and Mail on Sunday newspapers.
News - NORCECA Continental Cup: We gotta be friends and enemies at the same time
fivb.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from fivb.com Daily Mail and Mail on Sunday newspapers.