Imperial is a city in Chase County, Nebraska, United States. The population was 2,071 at the 2010 census. It is the county seat of Cha…Imperial is a city in Chase County, Nebraska, United States. The population was 2,071 at the 2010 census. It is the county seat of Chase County. The original town of Imperial was built on land homesteaded by Thomas Mercier and M. J. Goodrich. These men gave a town lot to anyone who would put up a building and help to start the town. Mercier was the first postmaster and took office on December 14, 1885.