The coordinated attacks followed shootings and bombings in the north earlier in the day that killed six others.
Today's explosions struck shortly before the evening iftar meal that ends the daylong fast during Ramadan.
Violence in Iraq has risen to its deadliest level since 2008, with more than 2,700 people killed since the start of April.
Police reported additional explosions that left four dead in Karbala, five in Nasiriyah and six in Musayyib. Hospital officials confirmed those casualty tolls.
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Officials say a powerful explosion also struck the cities of Kut, but they were unable to provide casualty figures. The officials spoke on condition of anonymity because they weren't authorised to release the information to reporters.
Hours later, a roadside bomb killed a municipal council member and his son in a town near Mosul. Gunmen in another area just south of Mosul also sprayed a security checkpoint with bullets, killing two policemen.