Hudson is a city located along the west border of Columbia County, New York, United States. The city is named after the adjacent Hudson River and ultimately after the explorer Henry Hudson. Hudson is the county seat of Columbia County. Hudson is paired with Pallisa, Uganda, as a sister city. According to the United States Census Bureau, the city has a total area of 6.0 sq.km (2.3 sq mi). 2.2 square miles (5.6 sq.km) of it is land and 0.2 square miles (0.4 sq.km) of it (6.47%) is water. Hudson is located on what began as a spit of land jutting into the Hudson River between the South Bay and North Bay, now both largely filled and partially degraded by industrial-era waste.