Overview
Marion County is Indianapolis. With 971,822 residents (Census ACS 5-Year, 2023), it's Indiana's most populous municipality, larger than 98% of U.S. counties. The consolidated city-county government means the numbers here reflect both urban core and suburban edges.
The median age is 34.3 years (Census ACS 5-Year, 2023), younger than 93% of U.S. counties. That youth shapes everything from housing demand to labor force size. A labor force of 515,586 (BLS LAUS, 2025) ranks in the top 2% nationally, and the unemployment rate of 2.8% (BLS LAUS, 2025) sits lower than 86% of counties across the country.
Median household income lands at $63,450 (Census ACS 5-Year, 2023), right at the national midpoint. Per capita income runs higher at $36,355 (Census ACS 5-Year, 2023), above 63% of U.S. counties. The gap between those two rankings hints at smaller household sizes pulling median figures down relative to individual earnings.
Demographics
Marion County is one of the most racially diverse municipalities in Indiana. White residents make up 50.5% of the population, Black residents 27.3%, Hispanic residents 13.4%, and Asian residents 3.9% (Census ACS 5-Year, 2023). The Black population share is higher than 89% of U.S. counties. The Hispanic share exceeds 80% of counties nationally and 93% within Indiana.
At 34.3 years, the median age falls below the national figure for all but 7% of counties (Census ACS 5-Year, 2023). Young populations correlate with growing labor markets and higher demand for schools, childcare, and rental housing.
Education attainment runs strong. 34.1% of adults hold a bachelor's degree or higher (Census ACS 5-Year, 2023), ranking above 85% of U.S. counties and 90% of Indiana counties. For a municipality this size, that's a deep talent pool, and one that employers in healthcare, tech, and logistics have built around.
Education
Marion County's public schools enrolled 159,994 students (Education Data Portal, 2021), a figure higher than 98% of U.S. counties. Per-pupil spending was $14,336 (Education Data Portal, 2020), slightly below the national average of roughly $15,000 but higher than 96% of Indiana counties. The state has historically spent less per student than the national norm, and Marion County outpaces nearly all of its in-state peers.
The student-teacher ratio of 15.9:1 (Education Data Portal, 2021) sits just above the national average of about 15.5:1 and is higher than 79% of counties nationally.
The graduation rate tells a harder story. At 84.2% (Education Data Portal, 2019), it falls below the national average of roughly 87% and ranks lower than 98% of Indiana counties. Only a handful of municipalities in the state graduate fewer students. Given the strong college attainment numbers among adults, the gap suggests that degree holders are moving in while locally educated students face steeper barriers to completion.
Economy & Employment
The labor force numbers are massive: 515,586 workers, with 500,969 employed and 14,617 unemployed (BLS LAUS, 2025). That 2.8% unemployment rate is lower than 86% of U.S. counties, a sign of tight labor conditions.
Median household income of $63,450 (Census ACS 5-Year, 2023) lands at the 50th national mark and the 36th within Indiana. For the state's largest municipality, sitting in the bottom half of Indiana counties on household income is notable. Average adjusted gross income was $65,362 per return (IRS SOI, 2021), closely tracking the median and suggesting a relatively compressed income distribution without extreme top-end skew.
The poverty rate is 14.8% (Census ACS 5-Year, 2023), higher than 64% of U.S. counties and 87% of Indiana counties. Roughly one in seven residents lives below the poverty line. Paired with middle-of-the-pack incomes, the poverty figure points to a split economy where job availability doesn't always translate into financial stability.
Total adjusted gross income across all filers reached $30.8 billion from 471,600 tax returns (IRS SOI, 2021). That aggregate wealth, topping 97% of U.S. counties, reflects sheer population size more than individual prosperity.
Housing & Cost of Living
The median home value is $207,000 (Census ACS 5-Year, 2023), above 63% of U.S. counties and 76% of Indiana counties. Median gross rent runs $1,107 per month (Census ACS 5-Year, 2023), higher than 80% of counties nationally and 90% within Indiana.
Marion County has 439,034 total housing units, with 42,372 sitting vacant (Census ACS 5-Year, 2023). The vacancy rate of 9.7% is lower than 74% of U.S. counties but near the middle of Indiana's range. For an urban municipality, that rate is unremarkable.
Fair Market Rent data from HUD (2026) is available for Marion County, though specific bedroom-level figures were not included in this dataset.
The rent-to-income math matters here. At $1,107 monthly, a household earning the median $63,450 spends roughly 21% of gross income on rent. That's within the commonly cited 30% affordability threshold, but households earning below the median, and 14.8% live in poverty, face a tighter squeeze.
The average commute is 21.3 minutes (Census ACS 5-Year, 2023), shorter than 57% of U.S. counties. The consolidated city-county layout keeps many workers close to employment centers.
Health & Wellness
Health metrics for Marion County show a mixed picture. Obesity affects 38.4% of adults (CDC PLACES, 2023), near the national midpoint. High blood pressure hits 38.0%, a rate higher than 83% of U.S. counties and the highest among all Indiana counties (CDC PLACES, 2023). Diabetes prevalence is 12.8%, above 78% of counties nationally and 93% within the state (CDC PLACES, 2023).
Depression affects 25.3% of adults, while 17.8% report frequent poor mental health days (CDC PLACES, 2023). The mental health figures rank lower than about two-thirds of U.S. counties, placing Marion County in the better-performing half on that measure.
On the access side, 10.7% of residents lack health insurance (CDC PLACES, 2023), higher than roughly half of counties nationally but above 89% of Indiana counties. That's a coverage gap worth watching. Annual checkup rates are strong at 79.0%, better than 90% of U.S. counties (CDC PLACES, 2023). Cholesterol screening hits 85.2%, also above 85% nationally (CDC PLACES, 2023).
The pattern: residents are getting screened and seeing doctors, but chronic disease rates, particularly hypertension and diabetes, remain elevated.
Climate & Natural Disasters
Marion County sits almost exactly at the national median for temperature. The annual average is 54.1°F (NOAA Climate Data Online, 2025), with typical highs of 63.5°F and lows of 44.6°F. Nothing unusual there.
Snow is a different story. At 31.7 inches annually (NOAA, 2025), the county gets more accumulation than 75% of U.S. counties. Indianapolis winters have a real bite. Annual rainfall is 38.2 inches (NOAA, 2025), right at the national midpoint.
FEMA has issued 18 disaster declarations for the county since 1991 (FEMA OpenFEMA, 2026). That's lower than 63% of U.S. counties, well below the median for a county this size. Severe storms account for most of the declarations, appearing nine times across that span. Flooding triggered major disaster declarations twice, in 1991 and 1996. Winter storms and snowstorms prompted emergency declarations three times, most recently in 2007.
The two 2020 declarations were for COVID-19, a statewide event, not a local hazard.
The most recent event was a winter storm emergency declared January 24, 2026. That fits the long-term pattern: winter weather is the county's most consistent federal trigger, not flooding or tornadoes.
For anyone planning around climate risk, the practical picture is cold, snowy winters with periodic severe storm seasons in spring and summer. The declaration frequency is lower than you'd expect for a metro this large, but the storm exposure is real and recurring, and it's not going away.
Financial Profile
Marion County generated $30.8 billion in total adjusted gross income from 471,600 tax returns, with total income of $31.1 billion (IRS SOI, 2021). Average income per return was $65,913 (IRS SOI, 2021), above 60% of U.S. counties.
Banking access is modest relative to population. The FDIC counted 13 bank branches holding $2.4 billion in deposits (FDIC Summary of Deposits, 2023). Total deposits rank above 85% of counties nationally, but the branch count, at the 63rd mark, suggests consolidation. For a municipality approaching one million residents, 13 branches means roughly one per 75,000 people.
Social Security benefits reach 161,950 OASDI beneficiaries (SSA OASDI, 2024), a count higher than 98% of U.S. counties. That's about 16.7% of the total population receiving benefits, a share consistent with the young median age.
Key Comparisons
Marion County's defining feature is scale. Population, labor force, enrollment, tax returns, and Social Security recipients all rank in the 98th or 99th range nationally. Within Indiana, it's the clear outlier on size.
Income tells a different story. Median household income sits at the 50th mark nationally and 36th within Indiana. Per capita income performs better at the 63rd mark nationally. The municipality earns average incomes but carries above-average poverty (14.8%, 87th in Indiana) and above-average rent costs (90th in Indiana).
Health measures show above-average chronic disease. Hypertension at the 83rd mark nationally and diabetes at the 78th stand out, especially against the strong checkup and screening rates. Access isn't the problem. Outcomes are.
Education attainment (85th nationally, 90th in state) contrasts with the graduation rate (32nd nationally, 2nd in state). The adults are educated. The schools are struggling to keep pace.
The labor market is tight at 2.8% unemployment (14th nationally, meaning lower than 86% of counties). Housing remains relatively affordable by national standards, though rent costs push higher than most of Indiana.
Data Sources
- Census ACS 5-Year, 2023 (population, income, housing, demographics, education attainment, commute)
- BLS LAUS, 2025 (unemployment, employment, labor force)
- CDC PLACES, 2023 (health metrics, insurance coverage)
- HUD Fair Market Rents, 2026 (fair market rent availability)
- FEMA OpenFEMA, 2026 (disaster declarations)
- IRS Statistics of Income, 2021 (tax returns, AGI, total income)
- FDIC Summary of Deposits, 2023 (bank branches, deposits)
- NOAA Climate Data Online, 2025 (temperature, precipitation, snowfall)
- SSA OASDI, 2024 (Social Security beneficiaries)
- Education Data Portal, 2019-2021 (enrollment, spending, student-teacher ratio, graduation rate)