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is a small city in Grant County in the U.S. state of Kentucky. The population was 3,227 at the 2000 census. It is the county seat of Grant County.
When Grant County was formed in 1820, William Arnold offered land for the county seat. Arnold was a veteran of the Revolutionary War and settled the area in 1795. The town built there was named after him when it incorporated in 1825.
The county grew slowly, reaching a population of just 281 by 1870. The Cincinnati Southern Railroad was built through the county in 1877, and Williamstown Lake was created in 1957. Finally, I-75 was built in the 1960s.
According to the United States Census Bureau, the city has a total area of 16.5 square miles (42.7 km²), of which, 16.0 square miles (41.3 km²) of it is land and 0.5 square miles (1.4 km²) of it (3.22%) is water.