Thong Nian Subdistrict is an official administrative tambon of Khanom District in Nakhon Si Thammarat, Thailand. Its official Thai name is ท้องเนียน and its six-digit administrative code is 801503.

Sources: OCHA COD-AB Thailand (Royal Thai Survey Department source), reconciled to current DOPA codes
Last reviewed: 15 September 2026
Content owner: Thailand Navigator Editorial Lead
Page type: Subdistrict guide

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