|16 January 1877||William Watson resigned from parliament.|
|17 January 1877||Writ of election issued by the Speaker of the Legislative Assembly.|
|5 February 1877||Nominations in Dungog|
|12 February 1877||Polling day|
|23 February 1877||Return of writ|
- William Johnston was a general merchant at Clarence Town. This was his first occasion standing for the Legislative Assembly.
|William Johnston (elected)||526||56.4|
|Total formal votes||938||98.4|
- "Mr William (Bourn Russell) Watson (1815-1877)". Former Members of the Parliament of New South Wales. Retrieved 1 May 2019.
- "Writ of election: The Williams". New South Wales Government Gazette (23). 17 January 1877. p. 223. Retrieved 6 June 2021 – via Trove.
- Green, Antony. "February 1877 The Williams by-election". New South Wales Election Results 1856-2007. Parliament of New South Wales. Retrieved 16 November 2019.