Range Description: Cassin's Vireo - Vireo cassinii

Summary of the extent of the breeding, wintering, migration and year-round range of this species in the Western Hemisphere, including Canada, U.S.A. and Mexico:

Canada - Breeding only: 242,622 square km
Mexico - Resident year-round: 2,142 square km; Breeding only: 2,520 square km; Wintering only: 873,122 square km; Migration only: 560,687 square km
U.S.A. - Breeding only: 673,972 square km; Wintering only: 75,113 square km; Migration only: 1,670,416 square km