Olathe is located in Johnson County. About 141,290 people live here (as of 2020). Between 2010 and 2020, the population grew from 125,872 to 141,290. The region is at 315 meters above sea level. The area covers about 159.6 square kilometers. There are about 6.121 streets in Olathe. The region was founded in 1857. The postal codes are 66051–66063. The dialing code is 913. Olathe is county seat of Johnson County, Kansas, United States. Among other things, Olathe has public Transport, restaurants, cafés, supermarkets, clothing Stores, attractions, schools, banks, hairdressers, dentists, doctors and pharmacies. More information at
www.olatheks.org.