There are two races or sub-species of the Yellow-rumped Warbler. These are the Yellow-rumped Warbler (Audubon's), seen almost entirely in the western regions of North America, from northern Bristish Columbia into the southern ranges of the Rockies to the Mexican borders. The other is the Yellow-rumped Warbler (Myrtle), the more common of the two. It is seen over a much larger area of the continent. These sub-species were at one time, given an individual species status of their own.
The Yellow-rumped Warbler does not migrate as far as some warblers. They can be still seen in the most southern US states in the winter months, including Mexico and the Caribbean islands. They are one of the first warblers seen in the spring migration going back to their breeding territories.
Avibase - the world bird database This site provides the user with a complete list of bird species, broken down per country, or in the example of the US or Canada, per state and province. Here, bird species names are available in other languages, a great asset to be used as a translation of foreign bird names.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.
I hope you will take advantage of these suggested websites. I have used each of them, in one way or another, throughout the years in my quest to better identify and understand our fine feathered friends.