Karachi: Sindh's Provincial Assembly elections in 1977 saw a voter turnout of 34.1%, with 2.29 million votes cast out of 6.71 million registered voters. This turnout highlights the urban-rural divide in political participation within Pakistan's second-most populous province, which includes urban centers like Karachi and Hyderabad and rural areas in interior Sindh.

According to Free and Fair Election Network, the 1977 elections did not have gender-disaggregated polling data, a practice that began in 2018. Sindh's electorate at the time included 3.80 million male voters and 2.91 million female voters, revealing a gender registration gap of 0.90 million. Rejected ballots accounted for 0.8% of the total votes, a figure that has varied in subsequent elections, reflecting changes in electoral processes and voter engagement.

The data underscores the historical variation in voter turnout in Sindh, which has fluctuated across twelve elections. The province's highest turnout was 60.7% in 1988, while its lowest was 29% in 1997. The electorate in Sindh has expanded significantly since 1970, with registered voters increasing from 5.3 million to 27.0 million by 2024.