Millcreek, IL is a city located in Union County, Illinois and has a land area of 0.34 square miles (0.88 km2). The water area for the city is 0.01 square miles or 0.03 km2. There is one unique zip code in Millcreek, Illinois and it is 62961. The area code(s) for Millcreek is 618.
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