Ministry of Interior -- Department of Provincial Administration (Amphoe Ko Chang)
Ko Chang District Office (Amphoe Ko Chang) is the seat of local civil administration for the whole Ko Chang district -- Koh Chang island itself plus outlying islets -- based in Ban Dan Mai on the east coast, the island's designated administrative centre. Ko Chang became a full district (amphoe) in 2007, having been split off from Laem Ngop district in 1994 as a minor district (king amphoe).
For day-to-day expat and property-owner business -- 90-day reporting, visa extensions and TM30 -- the relevant office is the Klong Prao immigration sub-office, not this district office (see the separate BAANLYY Koh Chang immigration office guide). Amphoe Ko Chang's own role centres on local civil registration and district-level administration across the district's two tambons (Ko Chang and Ko Chang Tai), most notably marriage registration for a foreigner marrying a Thai national -- a required step before applying for a Non-Immigrant O (marriage) visa or extension at Immigration.
Address: Moo 1, Ko Chang Sub-district, Ko Chang District, Trat 23170 (Ban Dan Mai, on the island's east coast)
Hours: Standard Thai government-office hours apply -- typically Monday-Friday, roughly 8:30 AM-4:30 PM with a midday break -- but this office's exact current public hours were not independently confirmed from an official source, so call ahead or confirm with Trat Provincial Hall before an important visit.
Phone: A phone-directory aggregator lists 039 586 100 for this office, but we could not independently confirm this from an official government source -- call the Trat provincial government line or the national government information hotline 1111 to confirm before an in-person visit.
Getting there: In Ban Dan Mai on Koh Chang's east coast, the island's official administrative centre -- reachable by car, motorbike or taxi via the east-coast road from the Ao Sapparot ferry piers in the north.
BAANLYY does not represent or speak on behalf of Ministry of Interior -- Department of Provincial Administration (Amphoe Ko Chang). Hours, required documents and procedures can change — always confirm current details by phone or in person before visiting. Visit the official Trat provincial government website →
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
Tell us your situation — our team can point you to what to bring and what to expect.