The body of a 67-year-old man, who had been reported missing since Sunday, was found on Tuesday, while the body of a 34-year-old woman had been found the day before.
Heavy rainstorms swept across the country overnight from Saturday to Sunday, with Livorno bearing the brunt of the flooding.
Four people from the same family were found dead in a flooded house in the city on Sunday, where 40 centimetres (16 inches) of rainfall in four hours transformed streets into rivers and washed away cars.
A fifth body was later found in an area devastated by landslides, while a sixth was found in a nearby hilltop neighbourhood.
The media is already pointing fingers at local officials, blaming inadequate work commissioned in 2015 to control and regulate the flow of a river whose waters overflowed following the storms.
Civil protection manager Giovanni Massini however said the works had been sound.
"What happened is a consequence of a really exceptional (meterological) event," Massini said, as quoted by La Repubblica daily.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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