Hummelstown, PA is a city located in Dauphin County, Pennsylvania and has a land area of 28.05 square miles (72.65 km2). The water area for the city is 0.33 square miles or 0.85 km2. There is one unique zip code in Hummelstown, Pennsylvania and it is 17036. The area code(s) for Hummelstown is 717.
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