Ponca is a city in Dixon County, Nebraska, United States. It is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area. The population was 961 at the 2010 census. It is the county seat of Dixon County.
Ponca is located at 42°33′50″N 96°42′38″W / 42.56389°N 96.71056°W / 42.56389; -96.71056 (42.563964, -96.710563).
According to the United States Census Bureau, the city has a total area of 0.7 square miles (1.8 km²), all of it land.