The "Sangharsh Yatra" will cover parts of Vidarbha region in east Maharashtra, once a stronghold of the party, in the next six days.
"The Congress has taken out the yatra to flag concerns of the people and their rights," a party statement said.
The fourth phase will culminate at Chikhli in Buldhana district on December 9, it said.
The Congress has until now covered parts of Western Maharashtra, Marathwada and North Maharashtra as part of the campaign in three separate phases since August this year.
The fifth and final phase of the campaign will cover the coastal Konkan region.
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