Franklin County, Idaho Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Franklin County, ID Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around averageHealthier than 73% of counties in Idaho
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C
Income Below averageWealthier than 81% of counties in Idaho
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D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Population | 15,053 | 1,929,983 | 337,468,954 |
| Population density (per sq mi) | 22.6 | 23.1 | 86.4 |
| Population growth (%/yr) | 1.84% | 2.12% | 0.59% |
| Median age | 32.2 | 38.7 | 37.3 |
| Households | 4,927 | 712,816 | 130,235,071 |
Population in Franklin County grew by 22.7% from 2009 to 2024, reaching 15,053 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Franklin County is Gen Z, aged 13–28, at 22.7% of residents. That is 0.1 points below Idaho as a whole.
- Gen Z 13–28 3,422 22.7% -0.1 pts
- Millennials 29–44 2,943 19.5% -1.2 pts
- Gen X 45–60 2,577 17.1% -2.1 pts
- Boomers 61–79 2,237 14.9% -1.1 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Idaho, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 48.0% of the people living in Franklin County and men 52.0%.
- Women 48.0% Idaho 49.6%
- Men 52.0% Idaho 50.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Franklin County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Franklin County has a the economy index of C, which means it is somewhat prosperous.
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median household income | $73,904 | $78,141 | $80,455 |
| Income growth (%/yr) | 5.00% | 5.97% | 4.80% |
| Unemployment rate | 2.4% | 3.7% | 5.2% |
The median household income in Franklin County is about 5% lower than in Idaho.
Housing
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median home price | $442,859 | $394,140 | $248,835 |
| Median rent | $893 | $1,236 | $1,407 |
| Homeownership rate | 78.1% | 72.3% | 65.2% |
The median home price in Franklin County is about 41.3 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $893 per month for that long.
Commute Time & Mobility
Commuters in Franklin County spend about 41 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 170 hours, about 7.1 full days, spent commuting.
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 20.3 | 18.0 | 22.4 |
| Round-trip commute (min) | 40.7 | 35.9 | 44.8 |
| Yearly time spent (hours) | 170 | 150 | 187 |
| Estimated yearly cost | $5,255 | $4,641 | $5,790 |
| Work from home | 12.0% | 13.3% | 15.0% |
| Highway traffic (vehicles/day) | 3,448 | 4,714 | 8,813 |
| Local road traffic (vehicles/day) | 1,028 | 865 | 1,355 |
Fastest commutes among counties in
Idaho:
Custer County (8.9 min), Lemhi County (11.6 min), Madison County (12.0 min).
Slowest:
Camas County (49.5 min), Boise County (38.0 min), Lincoln County (32.0 min).
The average commute time in Franklin County is 20 minutes, longer than the 18 minutes in Idaho.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Franklin County has a education index of D, which means it is barely educated.
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 15.6% | 27.1% | 31.6% |
| Average household size | 3.04 | 2.64 | 2.53 |
Highest education index among counties in
Idaho:
Latah County (0.4), Teton County (0.3), Ada County (0.3).
Lowest:
Clark County (0.1), Owyhee County (0.2), Lincoln County (0.2).
Health
Franklin County has a health index of B, which means it is quite healthy.
| Metric | Franklin County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.6 | 79.5 | 78.3 |
| Self-rated poor health | 13.4% | 15.6% | 16.3% |
| Smokers | 16.4% | 17.6% | 19.0% |
Highest health index among counties in
Idaho:
Madison County (0.8), Latah County (0.8), Ada County (0.8).
Lowest:
Shoshone County (0.8), Washington County (0.8), Lincoln County (0.8).
Franklin County, ID Compared With Nearby Counties
How Franklin County, ID compares with the 2 counties closest to it.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Franklin County, ID | 15,053 | $73,904 #2/3 | $442,859 #1/3 | 20.3 min #3/3 |
| Cache County, UT | 139,938 | $82,057 | $239,881 | 15.1 min |
| Bannock County, ID | 89,452 | $67,110 | $301,627 | 13.5 min |
Frequently Asked Questions
Common questions about Franklin County, Idaho.
What is the population of Franklin County, Idaho?
About 15,053 people live in Franklin County, Idaho, in 4,927 households of 3.0 people on average. The median age is 32.2, so residents are younger than the U.S. median of 37.3 by about 5 years.
How densely populated is Franklin County, Idaho?
Averaged over its land area, Franklin County, Idaho has 23 people per square mile, a density typical of rural areas. That is about 26% of the U.S. average of 86.
Is Franklin County, Idaho an affordable place to live?
The median home costs 6.0 times the median household income ($442,859 against $73,904), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $893 a month takes about 14% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is unemployment high in Franklin County, Idaho?
Unemployment in Franklin County, Idaho is only 2.4%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How educated are people in Franklin County, Idaho?
15.6% of adults in Franklin County, Idaho hold a bachelor's degree or higher (about 1 in 6), well below the U.S. share of 31.6%.
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