Canada, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, USA (B).
Breeds from central Alaska and western Canada (from southern Yukon) south in western USA to east-central California, east-central Nevada, central Utah and the Four Corners Region east to north-central New Mexico. Winters locally south-western USA and south from Mexico (Pacific slope and interior highlands) to Guatemala, El Salvador, Honduras and probably north-central Nicaragua.
 
Population
Estimated population is 13,000,000 (2010).
Hammond's Flycatcher (Empidonax hammondii) [XC565259]
by Richard E. Webster from Lower Penstemon CG, South Hills, Idaho, United States (call, interaction calls)
Hammond's Flycatcher (Empidonax hammondii) [XC424050]
by Peter Ward from Big Elk Meadows Trail, United States (song)