Police officials said that in the deadliest attack two blasts in Muqdadiyah targeted the home of a soldier, killing him, his wife, his two daughters and two sons as they were sleeping.
The entire house was destroyed in the attack.
Muqdadiyah is about 90 kilometres (60 miles) north of Baghdad.
A car bomb in a commercial street in Baghdad's western district of Amariyah killed four people and wounded 12 others, said police.
Also, in western Baghdad, a bomb blast near an out-door market in the Sadiyah neighbourhood killed two shoppers and wounded six.
Nobody immediately claimed responsibility for Saturday's attacks. But multiple bombings against civilians and security forces are frequently the work of the al-Qaeda affiliate in Iraq, which has been emboldened by successes of its fellow militants in the civil war next door in Syria and by widespread Sunni anger at the Shiite-led government.