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About Johnson County

Johnson County is a local government located in northeast Kansas that was organized on September 7, 1857. We serve a diverse and expanding population. More than 4,000 public servants are dedicated to helping Johnson County remain a safe, vibrant community.

Population: More than 600,000 residents (the most populous of Kansas’ 105 counties)

Geography: 473 square miles, nestled in the southwestern quadrant of the Kansas City metropolitan region.


Functions: Johnson County Government provides more than 350 services, including a wide variety of functions — everything from answering 9-1-1 calls and assisting libraries, to maintaining park facilities and reviewing building plans.

Our website is specifically organized to make these many services easier to find, and to help residents gain a better understanding of all that the county does. Please take a moment to browse and learn more about all the services we provide, or check out a complete directory of services here.

County Government Structure: Under the Home Rule Charter,  Johnson County is governed by a seven member, non-partisan, elected Board of County Commissioners (BOCC). The BOCC appoints the County Manager, County Clerk and County Treasurer. Johnson County also has an elected Sheriff and District Attorney.

Weekly BOCC Meetings: The BOCC meets every Thursday at 9:30 a.m. in the BOCC Hearing Room located on the third floor of the County Administration Building, 111 South Cherry Street, Olathe, Kansas 66061. 

County History: Established on August 25, 1855, and named after Reverend Thomas Johnson, Johnson County was one of the first counties in the Kansas Territory. Kansas became a state on January 29, 1861.

Read more about Johnson County history here.