Hardtner, KS is a city located in Barber County, Kansas and has a land area of 144.44 square miles (374.10 km2). The water area for the city is 0.31 square miles or 0.80 km2. There is one unique zip code in Hardtner, Kansas and it is 67057. The area code(s) for Hardtner is 620.
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