Delaware County's 2026 population is estimated at 17,661, reflecting a 0.15% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Delaware County is the 40th largest county in Iowa. The 2010 population was 17,763 and has grown -0.57% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.4 years
Female: 44.3 years
Male: 43.1 years
There are 13,474 adults, (3,784 of whom are seniors) in Delaware County.
Female: 8,584 (48.9%)
Male: 8,974 (51.1%)
The racial composition of Delaware County includes 94.18% White, and smaller percentages for Native American, other race, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 16,536 | 94.18% |
| Two or more races | 731 | 4.16% |
| Native American | 188 | 1.07% |
| Other race | 90 | 0.51% |
| Black or African American | 13 | 0.07% |
Delaware County 's average per capita income is $47,407. Household income levels show a median of $74,989. The poverty rate stands at 7.76%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $97,298 | - |
| Families | $89,677 | $116,475 |
| Households | $74,989 | $96,512 |
| Non Families | $46,331 | $58,930 |
Average Income
Median Household Income
Poverty Rate