Bahamas (NB), Belize (NB), Cayman Islands (NB), Cuba (NB), Guatemala (NB), Honduras (NB), Jamaica (NB), Mexico (NB), USA (B).
Vagrant to Colombia, Dominican Republic, Puerto Rico (NB), Venezuela, Virgin Islands (U.S.).
Breeds in south-eastern USA southern from southern Missouri, south-central Appalachians (West Virginia) and Virginia, and eastern from eastern Texas and south-eastern Oklahoma, but excluding Florida Peninsula. Migrates to western Caribbean (Bahamas, Cuba, Jamaica, Swan Is and Cayman Is) and north-eastern Central America (mainly Yucatán Peninsula and Belize).
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Swainson's Warbler (Limnothlypis swainsonii) [XC241784]
by Joseph M. Hood from Oconee River Greenway, Milledgeville, Georgia, United States (song)
Swainson's Warbler (Limnothlypis swainsonii) [XC103345]
by Mike Nelson from Schoolhouse Gap Trail, Great Smoky Mountains National Park, Tennessee, United States (call)
Subspecies
No subspecies.
Affinities not known. Genus has been merged with Helmitheros but, despite superficial similarities, the two are apparently not closely related. Recent studies indicate that it is genetically close to Vermivora cyanoptera and Golden-winged Warbler (Vermivora chrysoptera) and to Prothonotary Warbler (Protonotaria citrea). Birds breeding in Appalachians described as a geographical subspecies, alta, supposedly whiter below and browner (less olive) above in worn spring plumage; in fresh autumn plumage, however, more or less inseparable from lowland birds.