SINGAPORE - There will be six four-member Group Representation Constituencies (GRCs), up from two in the last election as the average size of GRCs continue to shrink.

But notably absent is the four-member Moulmein-Kallang GRC which was won by the People's Action Party team with 58.56 per cent of the votes in 2011.

The current MPs for the soon-to-be-defunct GRC are Minister of Communications and Information Yaacob Ibrahim, Minister for Transport Lui Tuck Yew, Ms Denise Phua and Mr Edwin Tong.

Large parts of Moulmein-Kallang GRC was originally within the Jalan Besar GRC, which has returned as a 'new' GRC this time round.

The revived Jalan Besar GRC has absorbed Whampoa SMC and now includes parts of Moulmein-Kallang and Tanjong Pagar GRCs.

The other new GRC is Marsiling-Yew Tee, which includes parts of the old Chua Chu Kang, and Sembawang GRCs.

The change could be to accommodate the population growth in Chua Chu Kang GRC's Yew Tee and Keat Hong wards where 2,500 BTO flats have been added.

Three five-member GRCs - Chua Chu Kang, East Coast and West Coast - have been downsized by one member each to become four-member wards.

The two jumbo six-member GRCs of Ang Mo Kio and Pasir Ris-Punggol have been retained.

There are now a total of 16 GRCs - six four-member GRCs, eight five-member GRCs, and two six-member ones.

With these changes, the average number of MPs per GRC will drop to 4.75 from five in the last election.