839 candidates, including from main contenders BJP, BSP, allies Congress and Samajwadi party, RLD as well independents, are in the fray from the seats in 15 districts where 26,823 polling stations have been set up.
Among the electorate are 1.17 crore women and 1,508 belonging to third gender category. The largest constituency in terms of electorate is Sahibabad, while Jalesar is the smallest. The maximum number of 26 candidates are in fray from Agra South, while the least number of aspirants are in Hastinapur which has six candidates.
Prominent contestants include Pankaj Singh (Noida seat), son of Union Home Minister Rajnath Singh, Congress Legislature Party (CLP) leader Pradeep Mathur (Mathura) against whom BJP spokesman Srikant Sharma is in fray, Mriganka Singh (Kairana), daugther of BJP MP Hukum Singh and controversial BJP MLAs Sangeet Som and Suresh Rana - Sardhan and Thanabhawan respectively.
Former BJP state president Lakshmikant Bajpai(Meerut), RJD chief Lalu Prasads son-in-law Rahul Singh (SP) from Sikandarabad, and Sandeep Singh, grandson of Rajasthan Govenor Kalyan Singh from Atrauli are some other key figures.
In 2012, both SP and BSP bagged 24 seats each, with Rashtriya Lok Dal headed by Ajit Singh bagging nine and Congress five and BJP 11.
BJP is hoping to improve its performance as it had swept the state in the 2014 general elections, which gave the saffron party majority in Lok Sabha, and none of other parties could open their account in the region.
Elaborate security arrangements have been made in all districts.
District Election Officer DK Singh said out of 887 polling centres in riot-scarred Muzaffarnagar, around 600 are critical where video cameras will be installed to maintain the strict vigil.
Around 6,000 paramilitary personnel are being deployed in all the 887 polling centres in Muzaffarnagar and neighbouring Shamli to instill a sense of fearlessness among voters, especially with focus on the areas which had witnessed communal riots in 2013.
Spearheading the BJP campaign, Modi had highlighted demonetisation as an "anti-graft" and "pro-poor" measure and promised to push his development agenda in the state.
Young guns Akhilesh Yadav and Rahul Gandhi, who have added a new dimension to the contest with the Samajwadi Party-Congress alliance, have claimed that BJP will face the wrath of the common man who "suffered" due to the note ban.
The first phase of voting in the Muslim-dominated region could throw light on the presence of All India Majlis-e-Ittehadul Muslimeen (AIMIM) led by Asaduddin Owaisi.
The Muslim-dominated areas in the belt will be an acid test for BSP chief Mayawati, who is banking heavily on Dalit and Muslim votes. The region was once BSPs favourite hunting ground.