When work was completed on the Shuswap\Okanagan Railway in 1892, Armstrong consisted of a lone box car which served as station and home for the rail agent. "Apart from the box car," remarked one pioneer, "there was just willows & swamp". Ironically, the largest settlement in Spallumcheen, Lansdowne, had been bypassed by the S & O Line. Undaunted, the citizens of the community packed up belongings, even buildings, and resettled beside the tracks in Armstrong.
Today the only standing testimony we have of this once sprawling western town is the old Lansdowne cemetery.
Armstrong was named after William Charles Heaton-Armstrong. In 1885 Heaton-Armstrong started a private bank and arranged a successful issue of bonds for the Shuswap and Okanagan Railway and visited Armstrong which was named for him in 1892.
The city was visited by his great grandson, Anthony Heaton-Armstrong in August, 2002.
Today, Armstrong is a vibrant community made up of young families, empty nesters, and retirees.
The 2021 census resulted in an increase in the Municipality bringing the current population to five thousand three hundred and twenty three (5,323). For more information relating to the Township's population please access the Statistics Canada website.