The coordinated attacks on Taji prison, north of Baghdad, and the Abu Ghraib facility, west of the Iraqi capital, were launched on Sunday night and raged for around 10 hours, officials said.
A police colonel said seven inmates escaped from Abu Ghraib during the clashes but were later arrested, while jihadists claimed on the Internet that thousands of prisoners were freed.
Officials said at least 20 members of the security forces were killed and 40 wounded in the attacks.
It was not immediately clear how many of the militants who attacked the prison were killed, wounded or captured.
The attacks were launched at around 9:30 pm (1830 GMT) yesterday when the gunmen fired mortar rounds at the prisons.
Four car bombs were detonated near the entrances to the jails, while three suicide bombers attacked Taji prison, said the police colonel.
Five roadside bombs also exploded near the prison in Taji.
The situation was eventually brought under control on Monday morning, according to the colonel.
"The security forces in the Baghdad Operations Command, with the assistance of military aircraft, managed to foil an armed attack launched by unknown gunmen against the ... Two prisons of Taji and Abu Ghraib," the interior ministry said in a statement late on Sunday night.
"The security forces forced the attackers to flee, and these forces are still pursuing the terrorist forces and exerting full control over the two regions," it said.
The attacks on the prisons came a year after al-Qaeda's Iraqi front group announced it would target the Iraqi justice system.
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