Karachi: Sindh recorded a voter turnout of 60.7% in the 1988 General Elections for its Provincial Assembly, with 4.18 million votes cast out of 6.89 million registered voters. The turnout highlighted the electoral engagement in Pakistan's second-most populous province, which serves as the nation's economic and commercial hub.

According to Free and Fair Election Network, Sindh's electorate consisted of 3.64 million male voters, accounting for 52.8%, and 3.25 million female voters, making up 47.2%. The gender registration gap stood at 0.39 million, representing 5.7% of the registered electorate. The province's electoral landscape is marked by a pronounced urban-rural divide, with Karachi and Hyderabad's urban constituencies contrasting with the rural areas of interior Sindh.

The 1988 elections did not provide gender-disaggregated data on votes cast, a practice that began in 2018. Rejected ballots totaled 40,473, constituting 1% of the total votes cast. Over the years, the rejection rate in Sindh has varied significantly, with the highest rates recorded in 2013 and 2018.

Sindh's electorate has expanded significantly, from 5.3 million in 1970 to an estimated 27.0 million in 2024, while the number of votes polled has increased from 3.1 million to 11.7 million over the same period. The province's highest ever recorded turnout was in 1988, with its lowest at 29% in 1997.