Madison County, Idaho Demographics 2026

Population Overview

Madison County is located in Idaho with a total population of 54,618. It is the 7th most populous county out of 44 in Idaho. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Madison County is 21.4 years. This is 43% lower than the state median of 37.3 years.

Economy, Income & Housing

The median household income in Madison County is $60,160. This is 23% lower than the state median of $77,800. It is also 25% lower than the national median of $80,734. The poverty rate stands at 24.5%. This is 131% higher than the state poverty rate of 10.6%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 8.3%. This is 122% higher than the state rate of 3.7%. The median home value is $414,800. Housing costs are about the same as the state median of $418,600. The home-value-to-income ratio of 6.9x suggests that housing affordability is a significant concern for many residents. 40.2% of occupied housing units are owner-occupied. This homeownership rate is 44% lower than the state average of 72.1%.

Race & Ethnicity

The largest racial or ethnic group in Madison County is White (non-Hispanic), making up 83.5% of the population. Hispanic or Latino residents account for 9.8%.

Education

41.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 31% higher than the state rate of 31.8%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 97.3%.

Data Sources & Methodology

All figures for Madison County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Idaho 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.