Madison County's 2026 population is estimated at 17,485, reflecting a 0.94% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Madison County is the 41st largest county in Iowa. The 2010 population was 15,738 and has grown 11.1% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.6 years
Female: 41.8 years
Male: 39.4 years
There are 12,668 adults, (2,995 of whom are seniors) in Madison County.
Female: 8,407 (49.7%)
Male: 8,519 (50.3%)
The racial composition of Madison County includes 95.13% White, and smaller percentages for Two or more races, Black or African American, Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 16,101 | 95.13% |
| Two or more races | 504 | 2.98% |
| Black or African American | 149 | 0.88% |
| Asian | 76 | 0.45% |
| Other race | 72 | 0.43% |
| Native American | 16 | 0.09% |
| Native Hawaiian or Pacific Islander | 8 | 0.05% |
Madison County 's average per capita income is $56,389. Household income levels show a median of $90,855. The poverty rate stands at 7.04%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $118,026 | - |
| Families | $110,706 | $125,207 |
| Households | $90,855 | $106,293 |
| Non Families | $50,919 | $62,625 |
Average Income
Median Household Income
Poverty Rate
