Registration
Bahrain
http://www.ipu.org/parline-e/reports/2371_E.htm
There were 318,668 registered voters in the first round according to IPU Parline, and the turnout was reported also to be 67% in the first round.
http://www.ipu.org/parline-e/reports/2371_E.htm
However, the following source reports the registration number as 318,000: http://www.aljazeera.com/news/middleeast/2010/10/2010102371445380323.html