Rao's visit is significant in the wake of Trinamool Congress' allegation that there were discrepancies in the district voters' list.
The observers would submit a report and brief the Commission on January 18, the sources said.
Rao declined a fresh offer to continue for personal reasons.
Former Election Commission observer K J Rao says political parties are in a race to display money power by erecting hoardings and banners across Patna. MI Khan reports
Four traders in Model Town were found not complying with the fresh applications.
There is no change in the date of polling in other four naxal-infested constituencies of Belaganj, Bodh Gaya, Gaya (mufassil) and Gaya (town), rescheduled for October 21 for security reasons
K J Rao also held a high-level meeting with the district officials on measures taken to check model code violations
Rao is one of 19 observers sent by the Election Commission to the state, where there have been widespread allegations by political parties of irregularities in the voters' list.
Accusing the opposition for the presence of bogus voters in electoral rolls, the ruling Left Front in West Bengal Monday urged the visiting Election Commission observers to go for a thorough scrutiny and remove all fake names.
Villagers of Shantipur and Phulia brought to Rao's notice names of voters in the list who were no more.
Chief Election Commissioner B B Tandon on Sunday came out in strong defence of EC Adviser K J Rao, who has been under attack from Congress and Rashtriya Janata Dal in the wake of his tough handling of poll irregularities.\n
The commission has also decided to direct the chief secretary to inquire as to how public property was allowed to be defaced in violation of the Bihar Prevention of Defacement of Property Act.
'The Election Commission has to deal with money power, intimidation tactics and caste politics.'
The party may announce Somen Mitra as the Lok Sabha candidate from North Kolkata whose name is set to be decided upon following intra-party elections to choose contenders -- a move initiated by the Congress vice-president to ensure transparency in ticket-distribution system. Renu Mittal reports.
That's all it takes to protect an institution -- just one person with no past and no greed for the future, says Shekhar Gupta.