I must commend the dedicated people who maintain the family history resources on Hawkesbury on the NET.
As someone with convict ancestors and their descendants who lived in this region I have found the various family history resources that include Church and Cemetery Registers on this site most helpful.
Just today on the AUS-NSW-HILLS-HAWKESBURY-HUNTER-VALLEY- Roostweb list Michelle Nichols announced
" We have recently transcribed a list of nearly 400 electors in the Electoral District of the Hawkesbury. The men nominated Richard William Piddington (1815-1887) to represent them in Parliament."
This list can be found in a collection at http://www.hawkesbury.net.au/lists/
If you have a connection with the Hawkesbury area this site is well worth a visit.