Southern Mexico: Pacific lowlands of Chiapas, from about Puerto Arista south to Puerto Madero (distance of c. 200 km), extending no more than 50 km inland.
 
Population
Estimated population is 20,000 - 49,999 (2010).
Giant Wren (Campylorhynchus chiapensis) [XC385766]
by Manuel Grosselet from Pijijiapan, Chiapas, Mexico (call)
Giant Wren (Campylorhynchus chiapensis) [XC220248]
by Andrew Spencer from Puerto Arista, Chiapas, Mexico (song)
Subspecies
No subspecies.
Sometimes considered conspecific with Bicolored Wren (Campylorhynchus griseus), but very widely separated geographically. Some variation in size, northern birds being on average larger, but differences insufficient to warrant naming of geographical subspecies.