Extreme south-western Colombia (south-western Nariño), western Ecuador (from central Manabí south, including La Plata I, to El Oro and extreme south-western Loja) and western Peru (south to Ancash).
 
Population
Estimated population is unknown (2010).
Snowy-throated Kingbird (Tyrannus niveigularis) [XC62100]
by Andrew Spencer from Milpe, Pichincha, Ecuador (call, song)
Snowy-throated Kingbird (Tyrannus niveigularis) [XC62105]
by Niels Krabbe from Milpe, Pichincha, Ecuador (call)
Subspecies
No subspecies.
Closest relatives of genus may be Empidonomus and Tyrannopsis. Recent molecular-sequence data indicate present genus is monophyletic and sister-group to clade that includes Empidonomus and Griseotyrannus. There are two main clades within genus, loosely corresponding to "tropical species assemblage" and combination of "W" and "E" species groups of earlier authors, but with some exceptions. Appears to be most basal to an expanded "tropical group" that also includes White-throated Kingbird (Tyrannus albogularis), Tropical Kingbird (Tyrannus melancholicus), Couch's Kingbird (Tyrannus couchii), Grey Kingbird (Tyrannus dominicensis) and Fork-tailed Flycatcher (Tyrannus savana).