Crowds attempted to storm three police stations and others torched a social club belonging to the armed forces, looting items inside, security officials said.
The head of Port Said's hospitals, Abdelrahman Farag said among the latest dead was a teenager shot in the chest. Another 433 people were injured in the rioting.
The violence comes a day after 31 people, including two anti-riot police, were killed in clashes in the Mediterranean city after a Cairo court handed down death sentences on 21 supporters of the local football club, Al-Masry.
On a grim day in Port Said, bodies wrapped in white shrouds were carried in open coffins by a sea of mourners along the city's main avenue.
"Our city is being hit by the interior ministry!" and "Down with Brotherhood rule!" chanted the crowd.
A brief burst of gunfire sent mourners running in several directions amid chaotic scenes, which later degenerated into rioting.