KARACHI: In the 1990 General Elections, Sindh reported a voter turnout of 43.5% for its Provincial Assembly, with 4.74 million votes cast out of 10.91 million registered voters. This turnout reflects the varying political engagement across the province’s urban and rural constituencies.

According to Free and Fair Election Network, Sindh, as Pakistan's second-most populous province and a key economic center, showed a notable gender gap in voter registration. Male voters constituted 54.4% and female voters 45.6% of the registered electorate, highlighting a registration gender gap of 8.7%. Gender-specific polling data, however, was not available for the 1990 elections, as systematic recording began with the 2018 elections.

The number of rejected ballots in the 1990 Sindh Assembly election was 33,560, accounting for 0.7% of the total votes cast. Historically, the rejection rate in Sindh has ranged from 0.7% in 1990 to 4.1% in both the 2013 and 2018 elections. The increase in rejection rates in more recent elections may be attributed to changes in electoral processes and voter roll complexities.

Sindh's registered electorate has seen significant growth, increasing from 5.3 million in 1970 to 27.0 million in 2024. The number of votes cast for the Provincial Assembly also rose from 3.1 million in 1970 to 11.7 million in 2024. The province's highest recorded turnout for the Assembly elections was 60.7% in 1988, while its lowest was 29% in 1997, indicating fluctuating political mobilization over the years.