Why Karnataka voter count is down by nearly million. The electorate size post-SIR stands at 45.5 million, reduced by almost 18 per cent, while Bengaluru city's voter list has shrunk by nearly half to 5.9. The revision exercise began with house-to-house verification by 60,923 Booth Level Officers (BLOs) between June 30 and August 17. The Karnataka government is launching an inquiry after Bengaluru’s voter count dropped by 4.