Cleveland Police said officers had detained a further 14 people in connection with the unrest on Sunday 4 August.
"Teams of officers headed out this morning to target those believed to be involved in the disorder," the force said.
"The ages of those arrested were between 11 years old and 43 years old."
The 11-year-old is thought to be the youngest person arrested over the nationwide disorder that followed the Southport stabbings.
Cleveland Police said they had now arrested 110 people following unrest in Hartlepool and Middlesbrough earlier this month.
As of last week, more than 520 people have been charged in relation to the week-long disorder in towns and cities across the UK, the Crown Prosecution Service said.