Police officials said the deadliest attack took place shortly before sunset when a bomb exploded at an outdoor market in the town of Mahmoudiyah, killing four people and wounding 12.
Mahmoudiya is 30 kilometers south of the capital.
A bomb blast at an outdoor market in Baghdad's eastern suburb of Maamil killed three shoppers and wounded seven, police said. In western Baghdad, police said a bomb blast in a commercial street killed two people and wounded seven.
In the northern city of Mosul, police said a car bomb exploded near an army patrol in the northern city of Mosul, killing two soldiers and wounding four.
Today's attacks came as Iraqis awaited the announcement of the election results of the April 30 national poll that will determine the next Iraqi prime minister.
It is the first parliamentary election since the withdrawal of US troops. Violence has surged in Iraq since last year, with the country weathering its deadliest bout of violence since the dark days of 2007 and 2008. United Nations figures show that violence last year in Iraq killed 8,868 people.