Sumner County is home to eleven incorporated communities and a number of smaller unincorporated communities.  The incorporated cities are Argonia, Belle Plaine, Caldwell, Conway Springs, Gueda Springs, Hunnewell, Mayfield, Milan, Oxford, South Haven, and Wellington. A portion of the City of Mulvane also lies in Sumner County.   The highlighted cities and listed at the left, are members of Sumner County Economic Development Commission.

Sumner County Economic Development Commission 123 N Jefferson • PO Box 279 • Wellington, KS 67152 Phone 620-326-8779 • email scedc@gosumner.com