Koei Chai Subdistrict is an official administrative tambon of Chum Saeng District in Nakhon Sawan, Thailand. Its official Thai name is เกยไชย and its six-digit administrative code is 600304.

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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