Hennessey, OK is a city located in Kingfisher County, Oklahoma and has a land area of 218.34 square miles (565.50 km2). The water area for the city is 1.27 square miles or 3.29 km2. There is one unique zip code in Hennessey, Oklahoma and it is 73742. The area code(s) for Hennessey is 405.
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