Rockport is a city in Ohio Township, Spencer County, Indiana, along the Ohio River. The population was 2,270 at the 2010 census. Once the largest community in Spencer County, the city has recently been surpassed by the town of Santa Claus. The city is the county seat of Spencer County. At 37°53'1" north, Rockport is also the southernmost city in the state, located slightly south of Evansville, Cannelton, or Mount Vernon (the westernmost city).