Question: What is the county seat serving the unincorporated community of Millerton , Kansas?

Context paragraphs:
Millerton, Marin County, California: Millerton is a small unincorporated community in Marin County, California.  It is located 3.5 mi northwest of Point Reyes Station, at an elevation of 43 feet (13 m).  Millerton is near Point Reyes Station.  The community is in ZIP code 94929 and area codes 415 and 628.

Mule Town, Ohio: Mule Town is an unincorporated community in southwestern Madison Township, Scioto County, Ohio, United States.  Located at the intersection of State Route 335, Lucasville-Minford Road and Bennett Road, it lies just north of the unincorporated community of Minford, 7 miles (11½ km) east of the census-designated place of Lucasville, and 14 miles (23 km) northeast of the city of Portsmouth, the county seat of Scioto County.  Sweet Run, a tributary of the Rocky Fork of the Little Scioto River, flows past the community.  Five businesses lie within Mule Town; Mule Town Mini-Mart, Foster and Fankell Garage, Bennet's Collision and Repair, the Minford Retirement Center and Shumway Tires.

Coronado, Kansas: Coronado is an unincorporated community in Wichita County, Kansas, United States, was once a thriving community.  Platted in 1885, Coronado was involved in the bloodiest county seat fight in the history of the American West.  The shoot-out on February 27, 1887, with boosters—some would say hired gunmen—from nearby Leoti left several people dead and wounded.  Afterwards numerous famous lawmen from Dodge City, which included Wyatt Earp and Bat Masterson, gathered to calm the storm that ensued after the bloody fight.  A small town called Farmer City, which was located between Coronado and Leoti, was hoped by some to become the county seat—which would end the fighting.  Leoti later won the right to become the county seat and now the other two towns consist mainly of farmland.

Millerton, Nebraska: Millerton is an unincorporated community in Butler County, Nebraska, in the United States.

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.

New Boston, Iowa: New Boston is an unincorporated community in central Lee County, Iowa, United States.  It lies along U.S. Highway 218 southwest of the city of Fort Madison, the county seat of Lee County.  New Boston is an unincorporated community.  The community is part of the Fort Madison–Keokuk, IA-MO Micropolitan Statistical Area.  There are no commercial establishments in New Boston, although this is the home of the New Boston Mennonite Church.

Pinedale, California: Pinedale is a previously unincorporated community in Fresno County, California.  It lies at an elevation of 348 feet (106 m).  It was once a rural community located on the Southern Pacific Railroad 3.5 mi north-northwest of Clovis but has since become surrounded and annexed by the city of Fresno.  Millerton Lake State Recreational Area is to its NE.  The ZIP Code is 93650, and the community is inside area code 559.

Millerton, Kansas: Millerton is an unincorporated community in Sumner County, Kansas, United States.

Ellicott City, Maryland: Ellicott City is an unincorporated community and census-designated place, along with being the county seat of local government in Howard County, Maryland, United States.  It is part of the Baltimore Metropolitan Area.  The population was 65,834 at the 2010 census.  Founded in 1772, the town contains the B. & O. Railroad Museum's branch at the Ellicott City Station, built in 1830 as the first terminus of the initial line.  The downtown historic district is located in the valley of the small Tiber River, with its east end abutting the Patapsco River, which forms the Baltimore County line.  As of the 2000 census, Ellicott City surpassed Towson (county seat of neighboring Baltimore County) for the first time, as the largest unincorporated county seat in the country.

Paulding, Mississippi: Paulding is an unincorporated community in and one of the two county seats of Jasper County, Mississippi.  It is the only unincorporated county seat in Mississippi.  Settled in 1833, it was named by United States settlers in honor of Revolutionary War hero John Paulding.  After its citizens refused to contribute to a new railroad, the community was bypassed in favor of Bay Springs, Mississippi, which was designated a railroad stop to the west and the second county seat.  It attracted more development and industry.

Supporting paragraphs: Millerton, Kansas Sumner County, Kansas
Answer: Wellington