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is a city in Union County, South Dakota, United States. It is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area. The population was 2,288 at the 2000 census.
North Sioux City is located at (42.530999, -96.495494), along the Big Sioux River.
According to the United States Census Bureau, the city has a total area of 2.3 square miles (5.9 km²), of which, 2.2 square miles (5.8 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.32%) is water.
North Sioux City has been assigned the ZIP code 57049 and the FIPS place code 45700.