Karachi: Voter turnout in Sindh during the General Elections of 2013 was recorded at 55%, with 10.44 million votes cast against a registered electorate of 18.98 million. The province, known for its economic significance and home to Pakistan's largest city, Karachi, displayed a turnout that reflected both urban and rural political mobilization patterns.

According to Free and Fair Election Network, Sindh's electorate in 2013 consisted of 10.48 million male voters, making up 55.2% of registered voters, and 8.50 million female voters, accounting for 44.8%. The gender registration gap was 1.98 million, approximately 10.4% of the electorate. Gender-disaggregated data for votes polled was not available for these elections, as systematic gender-disaggregated recording began with the 2018 elections.

The number of rejected ballots in the 2013 Sindh Assembly election stood at 422,863, constituting 4.1% of the total votes cast. This rejection rate was among the highest recorded in the province’s election history, matching the rate in the 2018 elections. The increase in rejected ballots may be attributed to changes in electoral processes and voter roll complexities.

Over the years, Sindh's registered electorate has seen significant growth, increasing from 5.3 million in 1970 to an estimated 27.0 million by 2024. Voter participation has also increased, with votes polled for the Sindh Assembly rising from 3.1 million in 1970 to 11.7 million in 2024. The highest recorded turnout for the Sindh Assembly was 60.7% in 1988, while the lowest was 29% in 1997.