The alterations in eight Group Representation Constituencies (GRCs) were published on the portal of the Government Gazette on July 21, including Chua Chu Kang, East Coast, Jurong, Moulmein-Kallang, Nee Soon, Pasir-Ris Punggol, Sembawang and Tanjong Pagar.
The adjustments aim to ensure an even distribution of voters across polling stations, the Elections Department said, adding that it had posted a notification of the changes in February.
The next polls must be held ahead of January 2017.