following points will help you out:
- The biggest election in the history of the world was 2014 elections in India to elect 16th Lok Sabha.
- The elections were consisted of 930,000 polling stations.
- There were 543 parliamentary constituencies. At that time, there were 814 million registered votes, including 168 million as first time voters.
- The elections witnessed the highest voter turnout of 66.38%