Four deaths were reported in the northeastern province of Chaco, with three others in the provinces of Jujuy and Tucuman, said local government officials speaking on condition of anonymity.
The total number of fatalities now stands at nine, they said, with hundreds of others injured and dozens arrested.
The Chaco victims comprised three civilians and a 35-year-old police officer, one local official said.
In Jujuy, the fatalities occurred in the towns of San Pedro and Perico, another official said.
Riots and looting first erupted in the city of Cordoba a week ago after police demanding higher wages refused to go on patrol there.
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Governors in Cordoba, Neuquen, San Juan, Catamarca and Rio Negro have defused police protests in their provinces by doubling and tripling police salaries.
Inflation in Argentina is running at a rate of 30 percent a year, according to private analysts, fueling the social tensions.
Looting has occurred repeatedly in Argentina since the late 1980s.