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.
Marshall County, Kansas Marshall County (standard abbreviation: MS) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 10,117. The largest city and county seat is Marysville.