HMP Stoke Heath near Market Drayton is operating at 110%, holding 728 prisoners, despite space for only 662.
The figures, released by the Howard League of Penal Reform, show how prisons are being forced to take more people into cells than they can accommodate.
The data shows each prison’s Certified Normal Accommodation (CNA) levels – the prison service’s measure of how many prisoners can be held safely and decently – compared to how many people are being kept in the jails.