Franklin County's 2026 population is estimated at 15,882, reflecting a 0.77% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Franklin County is the 22nd largest county in Idaho. The 2010 population was 12,782 and has grown 24.25% since 2010.
Data after 2023 is projected based on recent change
Overall: 33.3 years
Female: 34.5 years
Male: 32.3 years
There are 10,463 adults, (2,249 of whom are seniors) in Franklin County.
Female: 7,224 (48%)
Male: 7,832 (52%)
The racial composition of Franklin County includes 90.71% White, 3.53% other race, and smaller percentages for Native American, Black or African American, Native Hawaiian or Pacific Islander, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 13,658 | 90.71% |
| Two or more races | 776 | 5.15% |
| Other race | 532 | 3.53% |
| Native American | 52 | 0.35% |
| Black or African American | 16 | 0.11% |
| Native Hawaiian or Pacific Islander | 13 | 0.09% |
| Asian | 9 | 0.06% |
Franklin County 's average per capita income is $47,820. Household income levels show a median of $71,950. The poverty rate stands at 7.88%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,411 | - |
| Families | $86,933 | $106,259 |
| Households | $71,950 | $94,804 |
| Non Families | $33,125 | $37,275 |
Average Income
Median Household Income
Poverty Rate
