The federal constituency was created in the 1958 redistribution and is mandated to return a single member to the Dewan Rakyat under the first past the post voting system.

Ethnic breakdown of Kapar's electorate as of 2018[4] It was abolished in 1974 when it was redistributed between Kuala Selangor and Pelabuhan Kelang.

According to the federal gazette issued on 18 July 2023, the Kapar constituency is divided into 44 polling districts.

[5] constituency "His Majesty's Government Gazette - Notice of Contested Election, Parliament for the State of Selangor [P.U.

"Federal Government Gazette - Notice of Contested Election, Parliament for the State of Selangor [P.U.