Werriwa now covers an area in south-west Sydney, including the suburbs of Ashcroft, Austral, Bonnyrigg Heights, Bradfield, Busby, Carnes Hill, Cartwright, Casula, Cecil Hills, Edmondson Park, Glenfield, Green Valley, Heckenberg, Hinchinbrook, Horningsea Park, Hoxton Park, Long Point, Lurnea, Macquarie Fields, Macquarie Links, Middleton Grange, Miller, Prestons, Sadleir, and West Hoxton; as well as parts of Badgerys Creek, Bonnyrigg, Bringelly, Cecil Park, Denham Court, Ingleburn, Kemps Creek, Leppington, Mount Pritchard, and Rossmore.

In succeeding years, with demographic change and electoral redistributions, Werriwa began to shrink and, from 1913 onwards, no longer included Lake George.

The 1949 expansion of Parliament saw Werriwa lose most of its remaining rural territory to the newly created Division of Macarthur and move to approximately its current position in south-west Sydney, over 150 kilometres (93 mi) away from Lake George.

In more recent times, a by-election in March 2005 resulted in Labor's Chris Hayes elected with over 55% of the vote, in a 16-candidate race which saw no other candidate poll above 8%.

[4] Other languages spoken at home include Arabic 10.1%, Vietnamese 6.3%, Hindi 4.3%, Spanish 2.8% and Italian 2.2%.