Range Description: Marsh Wren - Cistothorus palustris

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 - Resident year-round: 31,959 square km; Breeding only: 1,104,907 square km; Migration only: 44,622 square km
Mexico - Resident year-round: 45,551 square km; Wintering only: 1,597,763 square km
U.S.A. - Resident year-round: 1,258,767 square km; Breeding only: 2,403,584 square km; Wintering only: 1,363,719 square km; Migration only: 2,496,067 square km