Hamilton County, Indiana Demographics 2026

Population Overview

Hamilton County is located in Indiana with a total population of 365,056. It is the 4th most populous county out of 92 in Indiana. The county encompasses 8 Census-designated places.

Age Demographics

The median age in Hamilton County is 38.4 years. This is about the same as the state median of 38.1 years.

Economy, Income & Housing

The median household income in Hamilton County is $121,530. This is 69% higher than the state median of $71,957. It is also 51% higher than the national median of $80,734. The poverty rate stands at 4.4%. This is 64% lower than the state poverty rate of 12.3%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 2.8%. This is 35% lower than the state rate of 4.3%. The median home value is $405,500. Housing costs are 86% higher than the state median of $218,200. The home-value-to-income ratio is 3.3x. 76.1% of occupied housing units are owner-occupied. This homeownership rate is 8% higher than the state average of 70.5%.

Race & Ethnicity

The largest racial or ethnic group in Hamilton County is White (non-Hispanic), making up 78.6% of the population. Asian residents account for 6.9%. The Black or African American population (4.4%) is well below the state average of 9.1%. The Asian population is significantly higher than the state average (6.9% vs 2.6%).

Education

61.9% of residents aged 25 and older hold a bachelor's degree or higher. This places Hamilton County in the top 10% of all counties in the state for educational attainment. This is 110% higher than the state rate of 29.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 97.3%. Notably, 23.5% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All figures for Hamilton County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Indiana and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.