Which is city is the county seat of a county with a standard abbreviation of SU?
Wellington, Kansas Wellington is a city in and the county seat of Sumner County, Kansas, United States. As of the 2010 census, the city population was 8,172.
Skagit County, Washington Skagit County is a county in the U.S. state of Washington. As of the 2010 census, the population was 116,901. The county seat and largest city is Mount Vernon. The county was formed in 1883 from Whatcom County and is named for the Skagit Indian tribe, which has been indigenous to the area prior to European-American settlement.