Sumner County's estimated 2026 population is 22,252 with a growth rate of -0.27% in the past year according to the most recent United States census data. Sumner County is the 25th largest county in Kansas. The 2010 population was 24,119 and has seen a growth of -7.74% since that time.
Data after 2023 is projected based on recent change
Overall: 41.3 years
Female: 41.7 years
Male: 40.2 years
There are 16,970 adults, (4,367 of whom are seniors) in Sumner County.
Female: 11,019 (49.3%)
Male: 11,334 (50.7%)
The racial composition of Sumner County includes 89.5% White, and smaller percentages for other race, Native American, Black or African American, Asian and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 20,007 | 89.5% |
| Two or more races | 1,400 | 6.26% |
| Other race | 337 | 1.51% |
| Native American | 278 | 1.24% |
| Black or African American | 246 | 1.1% |
| Asian | 85 | 0.38% |
Sumner County's average per capita income is $48,246. Household income levels show a median of $63,951. The poverty rate stands at 10.64%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,088 | - |
| Families | $86,419 | $103,372 |
| Households | $63,951 | $83,070 |
| Non Families | $37,864 | $45,129 |
Average Income
Median Household Income
Poverty Rate