- April: C.Y. O'Connor, the designer of the Fremantle harbour, arrives from New Zealand.
- 9 April: Midland Railway opened as far as Gingin.
- Robin Hood Lodge of the Ancient Order of Foresters opened.
- The barque Thornliebank (1,405 tons) burnt while at anchor in Owen's Anchorage, having brought a cargo of rails from England; later reconditioned for use as a coal hulk and then scuttled outside Rottnest.
- Census taken: eight towns in the colony with a population exceeding 500: Perth, 8,447; Fremantle, 7,077; Albany, 2,665; Geraldton, 1,218; York, 1,199; Newcastle, 742; Guildford, 726, and Bunbury, 572.
Freotopia
This page incorporates material from Garry Gillard's Freotopia website, that he started in 2014 and the contents of which he donated to Wikimedia Australia in 2024. The content was originally created on 6 August, 2015 and hosted at freotopia.org/timeline/1891.html (it was last updated on 19 December, 2018), and has been edited since it was imported here (see page history). The donated data is also preserved in the Internet Archive's collection.