The Townsend's Warbler breeds in mature, coniferous forests of western Canada, primarily in British Columbia and Yukon. It winters in Central America, as well as on the Pacific Coast of the United States, and rarely into the extreme southwestern corner of British Columbia. There are approximately 9.4 million individuals breeding in Canada, which represents 45% of the global population and a moderate degree of responsibility for Canada. An additional 6 million individuals breed in Alaska and migrate through Canada, boosting the proportion of the global population that occurs in Canada to 73%, corresponding to high responsibility. The Canadian population of Townsend's Warbler has shown little change relative to 1970 based on the Breeding Bird Survey. Confidence in this status is medium because only an intermediate portion of the Canadian range is sampled. The national population of Townsend's Warbler is within its goal range.