Mifflinville, PA is a city located in Columbia County, Pennsylvania and has a land area of 1.42 square miles (3.68 km2). The water area for the city is 0.17 square miles or 0.44 km2. There is one unique zip code in Mifflinville, Pennsylvania and it is 18631. The area code(s) for Mifflinville is 570.
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