Linn County's 2026 population is estimated at 233,667, reflecting a 0.71% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Linn County is the 2nd largest county in Iowa. The 2010 population was 211,713 and has grown 10.37% since 2010.
Overall: 39 years
Female: 39.8 years
Male: 38.3 years
There are 178,147 adults, (39,802 of whom are seniors) in Linn County.
Female: 116,498 (50.7%)
Male: 113,506 (49.3%)
The racial composition of Linn County includes 83.63% White, 5.97% Black or African American, and smaller percentages for Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 192,362 | 83.63% |
| Two or more races | 15,022 | 6.53% |
| Black or African American | 13,735 | 5.97% |
| Asian | 5,504 | 2.39% |
| Other race | 2,821 | 1.23% |
| Native American | 507 | 0.22% |
| Native Hawaiian or Pacific Islander | 53 | 0.02% |
Linn County 's average per capita income is $52,326. Household income levels show a median of $77,649. The poverty rate stands at 9.41%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $118,707 | $145,389 |
| Families | $100,553 | $127,058 |
| Households | $77,649 | $104,478 |
| Non Families | $46,799 | $63,156 |
Average Income
Median Household Income
Poverty Rate