Singh will address his first election meeting at Duliajan tomorrow before attending another one at Thowra constituency.
The Home Minister will address his third rally at Mahmora before attending his final election meeting.
Election to all these constituencies in Upper Assam will be held in the first phase on April 4.
The Home Minister will also attend two election rallies in West Bengal on Thursday before returning to the national capital.
Singh will again address several election rallies in Assam on April 6 in the constituencies where the polling will be held in the second phase.