Overview
Johnson County is the most populous county in Kansas, home to 614,764 residents (Census ACS 5-Year, 2023). That population ranks higher than 96% of all U.S. counties and sits at the top of Kansas. The county anchors the Kansas side of the Kansas City metropolitan area, and its economic indicators consistently place it among the wealthiest counties in the country.
Median household income here is $107,261 (Census ACS 5-Year, 2023), higher than 97% of U.S. counties. Per capita income reaches $58,292 (Census ACS 5-Year, 2023), above 98% nationally. The poverty rate is 5.3% (Census ACS 5-Year, 2023), lower than roughly 98% of counties across the country. By nearly every economic measure, Johnson County sits in the top tier.
The median age is 38.3 years (Census ACS 5-Year, 2023), younger than about 78% of U.S. counties. That's a telling number for a wealthy suburban county. It suggests families with children, not retirees, are driving the population base.
Demographics
Johnson County's population skews younger and more educated than most of the country. At 38.3 years, the median age falls well below the typical U.S. county (Census ACS 5-Year, 2023). Within Kansas, only about 23% of counties have a younger median age.
Education is where Johnson County stands apart most clearly. A full 56.9% of residents hold a bachelor's degree or higher (Census ACS 5-Year, 2023). That rate exceeds 99% of U.S. counties and 99% of Kansas counties. For context, the national average hovers around 33%. Johnson County's rate is nearly double that.
The racial composition breaks down as 76.9% white, 5.1% Asian, 4.7% Black, and 0.1% Native American, with 9.1% identifying as Hispanic or Latino (Census ACS 5-Year, 2023). The Asian population share is higher than 95% of U.S. counties. The Hispanic population, at 9.1%, ranks above roughly 70% of counties nationally.
The county's demographics reflect a well-educated, working-age population drawn to suburban employment centers and school districts. The education numbers, in particular, shape everything else: income, health outcomes, housing demand.
Education
Johnson County spends $16,376 per pupil (Education Data Portal, 2020), about 9% above the national average of roughly $15,000. Total enrollment across the county's schools reaches 96,172 students (Education Data Portal, 2021), placing it higher than 97% of U.S. counties by enrollment size.
The student-teacher ratio is 13.3 to 1 (Education Data Portal, 2021), better than the national average of about 15.5 to 1. Smaller class sizes correlate with the county's overall investment in public education. The graduation rate is 90.1% (Education Data Portal, 2019), above the national average of approximately 87%.
These education metrics connect directly to the county's economic profile. High educational attainment among adults feeds a skilled labor force, which attracts employers, which sustains high household incomes, which funds well-resourced schools. That cycle is visible in the data.
Economy & Employment
The labor force in Johnson County numbers 364,725 people, with 353,054 employed (BLS LAUS, 2025). The unemployment rate is 3.2% (BLS LAUS, 2025), lower than about 71% of U.S. counties. That's a tight labor market by any standard.
Income figures tell a consistent story. Median household income of $107,261 (Census ACS 5-Year, 2023) sits higher than 97% of all U.S. counties. Average adjusted gross income per tax return is $135,217 (IRS Statistics of Income, 2021), and average total income reaches $136,550 per return (IRS Statistics of Income, 2021). Both figures exceed 98% of counties nationally.
The county logged 303,160 tax returns with total adjusted gross income of $40.99 billion and total income of $41.40 billion (IRS Statistics of Income, 2021). Those aggregate numbers reflect a massive tax base for a single county.
Poverty affects 5.3% of residents (Census ACS 5-Year, 2023). In Kansas, only about 4% of counties report a lower rate. Nationally, Johnson County's poverty rate is lower than roughly 98% of counties. The gap between the county's income ceiling and its poverty floor is wide.
The mean commute time is 16.6 minutes (Census ACS 5-Year, 2023), shorter than about 90% of U.S. counties. That short commute suggests most residents work within the county or nearby in the metro area. It's a quality-of-life factor that compounds the economic advantages.
Housing & Cost of Living
The median home value in Johnson County is $366,000 (Census ACS 5-Year, 2023), above 91% of U.S. counties and the highest tier in Kansas. Median gross rent is $1,385 per month (Census ACS 5-Year, 2023), also above 91% of counties nationally.
The county has 255,320 total housing units with 10,543 vacant, yielding a vacancy rate of just 4.1% (Census ACS 5-Year, 2023). That vacancy rate is lower than about 98% of U.S. counties. Housing supply is tight. When vacancy drops this low, upward pressure on both rents and home prices increases.
Fair market rent data from HUD (2026) is available for the county but does not include bedroom-level breakdowns in the current dataset.
The relationship between income and housing costs matters here. A household earning the median of $107,261 buying at the median home value of $366,000 faces a price-to-income ratio of about 3.4. That's manageable but not cheap. For renters, $1,385 per month represents about 15.5% of the median household's gross income, well within the standard 30% affordability threshold.
The real pressure point is entry-level housing. With vacancy at 4.1% and home values at this level, first-time buyers face limited inventory. The numbers suggest a market that works well for current homeowners but presents barriers for those trying to get in.
Health & Wellness
Johnson County's health metrics are consistently better than most of the country. The obesity rate is 30.9% (CDC PLACES, 2023), lower than about 92% of U.S. counties. In Kansas, the county has the lowest obesity rate in the state.
Diabetes prevalence stands at 8.3% (CDC PLACES, 2023), lower than 95% of counties nationally and the lowest in Kansas. High blood pressure affects 29.3% of residents (CDC PLACES, 2023), a rate lower than about 84% of U.S. counties. These chronic condition rates track closely with income and education levels, and Johnson County ranks near the top in both.
Mental health indicators are strong in comparative terms. Poor mental health days affect 13.7% of residents, and depression prevalence is 18.8% (CDC PLACES, 2023). The poor mental health rate is lower than virtually all U.S. counties, while the depression figure is lower than about 94% nationally. Poor physical health days affect 9.1% (CDC PLACES, 2023), also among the lowest rates in the country.
Preventive care access looks solid. Annual checkup rates reach 77.8% (CDC PLACES, 2023), higher than 80% of U.S. counties. Cholesterol screening stands at 86.7% (CDC PLACES, 2023), above 95% of counties. The uninsured rate is 6.8% (CDC PLACES, 2023), lower than about 95% of counties nationally and the lowest in Kansas.
These numbers form a clear pattern. High income, high education, and low uninsured rates correlate with better chronic disease management and higher preventive care utilization. Johnson County is a textbook case of that relationship.
Climate & Natural Disasters
Johnson County sits in a middle-ground climate: average temperatures of 56.7°F (NOAA Climate Data Online, 2025), with highs reaching 66.8°F and lows dropping to 46.5°F. It's a four-season county. Winters bring an average of 16.8 inches of snow annually, and summers run warm enough to push the annual precipitation to 35.2 inches (NOAA Climate Data Online, 2025).
Severe storms are the county's defining hazard. Of the 12 federal disaster declarations since 1969 (FEMA OpenFEMA, 2026), severe storms account for the most incidents, with declarations in 2023, 2017, 2007, and twice in 1998. The most recent was DR-4747 in October 2023. Floods, ice storms, and a 1969 tornado round out the historical record.
Two of those 12 declarations are COVID-19 related, which inflates the count. Stripping those out, the county has seen 10 weather and natural disaster events over roughly five decades. That's a moderate pace, not an outlier. The disaster count is lower than 86% of U.S. counties (FEMA OpenFEMA, 2026), meaning most counties have seen more.
The practical concern for residents is storm preparedness, not chronic climate risk. Flood events appear twice in the record, both in the 1990s or earlier. The 2002 ice storm declaration is a reminder that winter hazards here aren't limited to snow totals. With the region's pattern of severe weather, a home's storm-readiness matters more than its flood zone rating for most parts of the county.
Financial Profile
Johnson County generated $40.99 billion in adjusted gross income across 303,160 tax returns (IRS Statistics of Income, 2021). The average AGI of $135,217 per return is higher than 98% of U.S. counties. Average total income per return, at $136,550, tells the same story (IRS Statistics of Income, 2021).
Banking access is strong. The county has 33 FDIC-insured bank branches holding $7.85 billion in total deposits (FDIC Summary of Deposits, 2023). That deposit base ranks above 94% of U.S. counties. Deposits per branch average roughly $238 million, reflecting a concentration of wealth in local financial institutions.
Social Security benefits reach 109,615 OASDI beneficiaries in the county (SSA OASDI, 2024). That's about 17.8% of the total population. Given the county's younger median age, this figure aligns with expectations. The beneficiary count ranks higher than 96% of U.S. counties in absolute terms, driven by the large population base.
The financial data paints a picture of concentrated affluence. Total AGI of nearly $41 billion from a single county represents a significant share of Kansas's overall tax base. That concentration has implications for state revenue, local government services, and regional economic influence.
Key Comparisons
Johnson County consistently ranks in the top 2% to 5% of U.S. counties across economic measures. Median household income ($107,261) and per capita income ($58,292) both rank in the top 3% nationally (Census ACS 5-Year, 2023). Within Kansas, the county leads in nearly every income and education category.
The poverty rate of 5.3% and unemployment rate of 3.2% both sit in the bottom tier nationally, meaning fewer residents face economic hardship compared to the vast majority of U.S. counties. The education attainment rate of 56.9% with a bachelor's degree or higher is almost unmatched, sitting above 99% of all counties.
Health outcomes follow the economic pattern. Obesity, diabetes, and uninsured rates all rank among the lowest in both Kansas and the nation. Preventive care utilization ranks among the highest.
Housing costs reflect the county's economic position. Home values at $366,000 and rents at $1,385 are high in absolute terms but remain proportional to incomes. The 4.1% vacancy rate signals a supply constraint that could push costs higher.
The most notable gap in the data is agricultural information. USDA Census of Agriculture data (2022) is not available for Johnson County, consistent with its suburban character and limited farmland.
Where Johnson County's numbers dip closer to average is in disaster exposure (12 declarations, roughly middle of the pack) and student-teacher ratio (13.3 to 1, better than average but not at the extremes of the spending curve). Per-pupil spending at $16,376, while above average, ranks at about the 66th position nationally, a moderate figure given the county's wealth.
Data Sources
- Census ACS 5-Year, 2023: Population, income, housing, demographics, education attainment, commute time, poverty rate
- BLS LAUS, 2025: Unemployment rate, employment, labor force
- CDC PLACES, 2023: Health metrics including obesity, diabetes, depression, insurance coverage, preventive care
- HUD Fair Market Rents, 2026: Fair market rent data
- FEMA OpenFEMA, 2026: Disaster declarations and history
- IRS Statistics of Income, 2021: Tax returns, adjusted gross income, total income
- FDIC Summary of Deposits, 2023: Bank branch count and deposit totals
- NOAA Climate Data Online, 2025: Temperature and precipitation data
- SSA OASDI, 2024: Social Security beneficiary counts
- USDA Census of Agriculture, 2022: No data available for this county
- Education Data Portal, 2019-2021: Per-pupil spending, enrollment, student-teacher ratio, graduation rate