South-western USA and Mexico, from California, Utah and Colorado eastern inland to Missouri and Louisiana, through coastal Texas and Baja California, south to Michoacan, Puebla and Veracruz.
 
Population
Estimated population is 1,100,000 (2010).
Greater Roadrunner (Geococcyx californianus) [XC663090]
by Bobby Wilcox from San Bernardino National Wildlife Refuge, Cochise County, Arizona, United States (bill rattle)
Greater Roadrunner (Geococcyx californianus) [XC453114]
by Bobby Wilcox from Otay Lakes, San Diego Co., California, United States (bill snaps)
Subspecies
Population from Texas (USA) south to Nuevo Leon and Veracruz (Mexico) averages smaller and has been described as subspecies dromicus, but birds from this region overlap in size with those in other parts of range.
No subspecies.
Similar Species
Like Lesser Roadrunner (Geococcyx velox) but underparts streaked.
References
See References.