Brunei Darussalam (B), Cambodia (B), Indonesia (B), Malaysia (B), Myanmar (B), Philippines (B), Thailand (B), Vietnam (B).
Extreme southern Myanmar (southern Tenasserim), southern Thailand, southern Cambodia, Cochinchina, and Peninsular Malaysia southern on coasts and islands to Sumatra and satellites; western Philippines (Palawan and Balabac), Natuna Is, coasts of Borneo and islands off north-eastern (including Maratua), and also coasts of Java.
 
Population
Estimated population is unknown (2010).
Copper-throated Sunbird (Leptocoma calcostetha) [XC671572]
by Kim Chuah Lim from Mangrove track, Kep (west), Cambodia (call)
Copper-throated Sunbird (Leptocoma calcostetha) [XC458447]
by Greg Irving from Ketam Quarry, Singapore (call)
Subspecies
No subspecies.
Genus often subsumed in Nectarinia. Genus names Leptocoma and Chalcostetha described simultaneously, and former has been selected by First Reviser as having precedence. Type of genus Chalcostetha. No obvious close relatives. Several subspecies have been proposed from various islands off Sumatra, Borneo and Natunas, but none considered adequately differentiated.