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  4. Postal Code 28420

South Korea Postal Code 28420 Boundary Map

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Postal Code28420
Postal Code NameCheongju-si
ProvinceChungcheongbuk-do
CountyCheongju-si
TimezoneKorean Standard Time (KST)
Adjacent Postal Codes28389
28415
28416
28417
28419
28421
28422

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