Olathe is a city located in Johnson County Kansas. Olathe has a 2023 population of 146,297. It is also the county seat of Johnson County.Olathe is currently growing at a rate of 1.14% annually and its population has increased by 3.46% since the most recent census, which recorded a population of 141,400 in 2020.
The average household income in Olathe is $116,624 with a poverty rate of 6.02%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Olathe is 35.9 years, 35.5 years for males, and 36.4 years for females.
In 1900, at the turn of the century and almost 40 years after Olathe’s incorporation, the population stood at 3,451. This kept relatively stagnant over the decades that followed due to the town’s relative obscurity and insignificance.
By the end of the 1940s, Olathe had seen a 6% increase in the population, bringing it up to just shy of 11,000 in 1960. This continued to rise further, seeing an increase of almost 7,000 people by 1970, and an additional 19,000 people by the end of the decade.
These numbers have continued to steadily rise each year by year, and this growth can be mainly attributed to the construction of the Interstate Highway, bringing Olathe’s proximity and access to and from nearby Kansas City ever closer, and making it more accessible for surrounding towns and cities.
While Olathe's population is just over 137,000 in 2019, some estimates peg its population at 300,000 within 20 years (https://fox4kc.com/2018/09/17/olathe-police-finding-officer-recruitment-a-struggle-as-city-grows/)."
The town of Olathe was founded in 1857, getting its name from the Shawnee word for "beautiful.” It was incorporated later in the same year, and despite not being the first city in the county, it was named county seat in October of 1859, due in no small part to its rapid growth.
After being the site of much activity during the American Civil War, Olathe went on to become a major stop on the California Trail, the Oregon Trail and the Santa Fe Trail. Catering to travelers moving along these paths became the primary income source for local businesses. Once the construction of the Transcontinental Railroad saw completion, however, these westward trails lost significance, and Olathe withered into obscurity.
The construction of the Interstate Highway system in the 1950s saw Olathe linked to neighboring Kansas City, resulting in tremendous residential growth and Olathe becoming part of the Kansas City metropolitan area. The 1980s saw even more of a boom in population growth due to tremendous commercial development.
By 2001, Olathe’s population surpassed 100,000, and in 2008 Olathe was ranked the 24th fastest growing city in the United States. Olathe was voted in the same year by CNN and Money and Money magazine as the 11th best city in which to live in the United States.
According to the most recent ACS, the racial composition of Olathe was:
Black or African American
Two or more races
Native Hawaiian or Pacific Islander
Average Family Size
Average Household Size
Rate of Home Ownership
Less Than 9th Grade
9th to 12th Grade
High School Graduate
High School Graduation Rate
The highest rate of high school graduation is among native american people with a rate of 86.87%.
The highest rate of bachelors degrees is among white people with a rate of 47.81%.
Other Indo-European Languages
Asian and Pacific Island Languages
84.86% of Olathe residents speak only English, while 15.14% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 8.47% of the population.
Overall Poverty Rate
Male Poverty Rate
Female Poverty Rate
The race most likely to be in poverty in Olathe is Hispanic, with 22.19% below the poverty level.
The race least likely to be in poverty in Olathe is White, with 5.08% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.35%. Among those working part-time, it was 9.3%, and for those that did not work, the poverty rate was 13.03%.
Overall Marriage Rate
Male Marriage Rate
Female Marriage Rate
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.
Second Gulf War
First Gulf War
World War II
Less Than 9th Grade
High School Graduate
Bachelors or Greater
Veteran Poverty Rate
Veteran Disability Rate
Labor Force Participation
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Born in Olathe
87.31% of Olathe residents were born in the United States, with 45.85% having been born in Kansas. 5.47% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.