Sumner County, Kansas is in south-central Kansas, just north of the Oklahoma state line, and its county seat is the city of Wellington.

Quick Scoop: Where Is Sumner County, Kansas?

  • Located in south-central Kansas.
  • Borders Oklahoma directly to the south.
  • About 23–25 miles south of Wichita, within the Wichita metropolitan area.
  • Wellington is the county seat and main hub.

A Simple Mental Map

If you imagine Kansas as a rectangle:

  • Sumner County sits along the southern edge (the Kansas–Oklahoma border).
  • It’s slightly west of the state’s vertical centerline, directly south of Sedgwick County (where Wichita is).

Basic Facts at a Glance

  • State: Kansas.
  • Region: South-central Kansas, part of the Wichita metro area.
  • County seat: Wellington.
  • Nickname context: Often associated with large-scale wheat farming and sometimes linked to “Wheat Capital of the World” branding around Wellington.
  • Key roads: Interstate 35 and U.S. Highway 81 run through the county, making it easy to locate on a road map.

“Where is Sumner County Kansas?” – In short: just south of Wichita, hugging the Oklahoma border, with Wellington at its center.

TL;DR: Sumner County, Kansas is directly north of Oklahoma in south- central Kansas, about 25 miles south of Wichita, with Wellington as its county seat.

Information gathered from public forums or data available on the internet and portrayed here.