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is a city in and the county seat of Union County, Ohio, United States. The population was 15,942 at the 2000 census, and the Census Bureau estimated that it had risen to 17,621 by 2006.
According to the United States Census Bureau, the city has a total area of 15.6 square miles (40.4 km²), of which, 15.5 square miles (40.2 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.51%) is water.