In the Moreton Bay Courier, on 22nd April, 1848 there appeared a list of names. These names constituted the Electoral List for the town of Brisbane, District of Moreton, County of Stanley for 1848.
To qualify for the list it appears that you had to have some freehold land or a household.
William Jackson Sparkes is listed as Wm J. Sparkes, qualification - household, where propterty is situated - North Brisbane.
This article appears again in 1849 where he is similarly listed.