Gem County's 2026 population is estimated at 22,803, reflecting a 2.12% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Gem County is the 19th largest county in Idaho. The 2010 population was 16,686 and has grown 36.66% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.2 years
Female: 45 years
Male: 42.9 years
There are 16,091 adults, (4,755 of whom are seniors) in Gem County.
Female: 9,994 (48.5%)
Male: 10,620 (51.5%)
The racial composition of Gem County includes 86.15% White, 3.58% other race, and smaller percentages for Asian, Native American, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 17,758 | 86.15% |
| Two or more races | 1,803 | 8.75% |
| Other race | 737 | 3.58% |
| Asian | 159 | 0.77% |
| Native American | 155 | 0.75% |
| Black or African American | 2 | 0.01% |
Gem County 's average per capita income is $40,172. Household income levels show a median of $64,605. The poverty rate stands at 11.98%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $87,107 | - |
| Families | $74,981 | $94,699 |
| Households | $64,605 | $86,642 |
| Non Families | $31,133 | $52,630 |
Average Income
Median Household Income
Poverty Rate
