Sitting just inside Alberta’s eastern boundary along the Trans-Canada Highway, Walsh occupies a quiet stretch of the province where the prairies meet the Saskatchewan border. The hamlet falls within Cypress County and is part of Census Division No. 1, with the federal riding of Medicine Hat representing the area at the national level. At an elevation of 745 metres above sea level, the community sits on the open plains characteristic of this corner of Alberta.
Walsh carries a notable piece of Western Canadian history in its name, believed to honour James Walsh, a prominent officer of the North-West Mounted Police who established a fort in the area during the early years of that organization. The hamlet recorded a population of 50 residents in the 2021 Census, spread across 26 of its 32 private dwellings, which represented a decline of roughly 16.7 per cent from the 60 residents counted in 2016. That earlier figure itself reflected modest growth from the 58 residents recorded in 2011. Walsh covers a land area of 1.22 square kilometres, giving it a population density of approximately 41 people per square kilometre.