Karachi: Sindh recorded a voter turnout of 57.7% in the Provincial Assembly elections of 1970, with 3.08 million out of 5.34 million registered voters casting their ballots. This marked a significant political event in Pakistan's history, as the province's diverse electorate spanned both urban and rural regions, highlighting distinct political mobilization patterns.

According to Free and Fair Election Network, Sindh was home to 3.17 million male and 2.16 million female registered voters in 1970, with a gender registration gap of 1.01 million. The elections saw 38,032 ballots rejected, accounting for 1.2% of the total votes polled. This rejection rate has varied in subsequent elections, reflecting changes in electoral processes and voter participation.

Sindh's electorate has grown significantly, from 5.3 million registered voters in 1970 to 27 million in 2024. Over the twelve electoral cycles since 1970, the province's turnout has fluctuated, with the highest turnout of 60.7% recorded in 1988 and the lowest at 29% in 1997. The data underscores the evolving political landscape in Sindh, shaped by its role as a major economic hub and its socio-economic diversity.