Which is city is the county seat of a county with a standard abbreviation of SU?
Sumner County, Kansas Sumner County (standard abbreviation: SU) is a county located in the U.S. state of Kansas. As of the 2010 census, the population was 24,132. Its county seat is Wellington.
Waupaca, Wisconsin Waupaca is a city in and the county seat of Waupaca County in the state of Wisconsin, United States. The population was 6,069 at the 2010 census. The city is believed to be named after Sam Waupaca (or Chief Wapuka) of the Potowatomi tribe.