Johnson County Kansas means in slang: Johnson County in Kansas is home to the richest county in Kansas. It also ranks 31st in wealth in the United States. The median household income in Johnson County ranges from the low 60,000s to the high 70,000s. Johnson County, Kansas, had 544,179 people according to the 2010 US Census. Johnson County has the highest population of all the Kansas counties. CNNMoney Magazine ranked three cities within the county among its Top 100 Places To Live, With Overland Park ranking 9th and Olathe 11th respectively, and Shawnee 39th. Mission Hills and Leawood are the richest two cities in the county. Mission Hills had a median household income of 188,821, while Leawood was slightly higher at just over 117,000. Johnson County, Kansas’ snobbiest county is well-known to the rest. Johnson County is home to some of Kansas City’s wealthiest residents and has strong republican roots. The county has seen a 20.6 percent increase in population between 2000 and 2010. It is easy to see how the county will continue growing over the next few years. Three items best representing Johnson County are George W. Bush’s large SUVS and Polo Ralph Lauren. (in Slang Dictionary, added by Yadiel Vance)