The women were kidnapped a day earlier by armed men from inside a food company, in Tamaulipas state. The bodies were located along a highway in the northern state.
The state, south of the US state of Texas, is among the hardest hit by Mexico's violent crime, much of it gang and drug related.
Authorities said they were investigating the crime.
Journalist found dead in 'pool of blood' at home in northern Mexico
Racked by brutal violence linked to the multi-billion-dollar narcotics trade, the country posted a record number of homicides last year: 25,339.
Kidnap charge spotlights justice divide in Mexican election
Earlier, a female journalist was found dead Thursday at her home in Mexico with stab wounds to the back of the neck, the state attorney general’s office said.
The 52-year-old, Alicia Diaz Gonzalez, was found by her children, who were upstairs at the time and did not hear anything awry, the office said.
The woman “was on the floor, face down, in a pool of blood having suffered blows,” a source from the Nuevo Leon state prosecutor’s office told AFP on condition of anonymity.
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