The Townsend's Warbler (Setophaga townsendi) is native to North America, predominantly found in the Pacific Northwest of the United States and Canada. Its geographical distribution includes parts of Alaska, Washington, Oregon, and Northern California, extending into British Columbia in Canada.

The Townsend's Warbler typically inhabits coniferous forests and mixed woodlands, particularly those dominated by spruce, fir, and hemlock trees. It prefers mature forests with dense foliage and a moist climate. During migration, it can also be found in a variety of habitats, including shrublands and coastal regions.

The Townsend's Warbler occupies the ecological niche of an insectivorous bird, feeding primarily on insects and spiders found in the foliage of trees. It plays a role in controlling pest populations and contributes to the ecological balance of its forest habitat. During migration and winter, it may adapt to eat more berries and plant material.