The binge of bloodshed began Friday, Mexico City's Aristegui News reported Monday based on police accounts from local media accounts.
At least 23 of the deaths, which were reported from various regions of the country, occurred between Sunday afternoon and Monday afternoon.
Eight of the deaths occurred in the state of Sinaloa, where five people were killed in a shootout between suspected criminals and police in Los Mochis. Three of the dead were suspects, said the mayor of Ahome, while the others were a police officer and a civilian.
In Tamaulipas, three people were found dead, while two men found shot on the side of a road outside to San Isidro Mazatepec were among three people killed in Jalisco.
A body found in a plastic bag Monday in Ecatepec was the second person found in Mexico state killed during the period.
Police in Emiliano Zapata in Morelos state said they found the bodies of a man and woman buried in a home.
A soldier was shot dead inside his car in Guerrero state, where gunmen also stormed a house and killed two men.
An employee of the Superior Court was shot and killed by gunmen as he drove his car in Oaxaca, while a 30-year-old man was killed and four people injured in the Federal District during a shootout at an agricultural colony east of Mexico City.