Colombia, Costa Rica, Honduras, Nicaragua, Panama.
Eastern Honduras, eastern and central Nicaragua, Costa Rica (except drier north-west), Panama (including Isla del Rey in Pearl Is, where perhaps introduced by Indians) and adjacent north-western Colombia.
 
Population
Estimated population is unknown (2010).
Grey-headed Chachalaca (Ortalis cinereiceps) [XC199022]
by Peter Boesman from Soberan\u00eda National Park (Gamboa), Colon, Colon, Panama (call, song)
Grey-headed Chachalaca (Ortalis cinereiceps) [XC253661]
by Adam Sell from Altos del Torre\u00f3n, Altos de Cerro Azul, Panama (call, flight call, song)