Franklin County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 22nd-largest in Idaho
The population of Franklin County, Idaho is 14,715 as of the 2023 American Community Survey, making it the 22nd-largest county in Idaho. The median household income is $65,991, the median home value is $304,000, and the median age is 32.5.
The population of Franklin County has grown 22.3% since 2010 (12,782 → 15,638), a +1.45% annualized rate.
14,715
Population
+1.45%
Annual growth
22
People / sq mi
$65,991
Median Income
$304,000
Median Home Value
Franklin County covers 663 sq mi of land at 22.2 people per square mile.
About Franklin County, ID
Franklin County is distinguished by its share of foreign-born residents, 62.2% of the population. With 14,715 residents, Franklin County is a county in Idaho. It ranks #22 among counties in Idaho by population.
Median household income is $65,991, below the US median of $78,538. Poverty is relatively low for US counties at 5.4%, below the national 12.4%. Home values run above average at $304,000, with typical rent around $831.
21.5% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is on the higher side at 11.3%, below the national 14.0%, and the average commute runs about 25 minutes each way.
The large foreign-born share is a defining thread in Franklin County, shaping language, household composition, and the labor force behind the economic figures above.
Franklin County Population History (2010-2024)
The county of Franklin County had a population of 12,782 in 2010 and 15,638 in 2024, a 22.3% growth over 14 years. The peak was 15,638 in 2024. Average annual growth rate: 1.46%.
15,638
Population (2024)
12,782
Population (2010)
15,638
Peak (2024)
1.46%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 12,782 |
| 2011 | 12,813 |
| 2012 | 12,801 |
| 2013 | 12,809 |
| 2014 | 12,924 |
| 2015 | 12,974 |
| 2016 | 13,345 |
| 2017 | 13,501 |
| 2018 | 13,718 |
| 2019 | 13,898 |
| 2020 | 14,283 |
| 2021 | 14,673 |
| 2022 | 15,172 |
| 2023 | 15,516 |
| 2024 | 15,638 |
Race & Ethnicity
| White | 91.9% |
| Black or African American | 0.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.8% |
| Two or More Races | 0.0% |
Age & Sex
32.5
Median Age
48.4%
Female
51.6%
Male
14.2%
Age 65+
Age Distribution
Children (under 15): 24.8% · Seniors (65+): 14.2%
Income & Poverty
| Median household income | $65,991$-8,645 vs state |
| Mean household income | $91,877 |
| Per-capita income | $30,698 |
| Poverty rate | 5.4%-1.6% vs state |
| Unemployment rate | 1.1% |
| Employment-to-population | 61.0% |
Top Industries by Employment
The largest employment sector in Franklin County is manufacturing, accounting for 21.2% of workers.
How residents commute
0.2%
Drive alone
2.6%
Carpool
75.7%
Public transit
11.3%
Work from home
25.3 min
Avg commute
Housing
$304,000$-72,000 vs state
Median home value
$831
Median rent
75.2%
Homeownership rate
5,122
Total housing units
95.1%
Occupied
4.9%
Vacant
24.8%
Renter-occupied
Social & access
88.7%
With health insurance
97.1%
With broadband internet
62.2%
Foreign-born
4.4%
Veterans (18+)
12.2%
With a disability
93.6%
Speak language other than English at home
Education
94.0%
High School+
21.5%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Franklin County, Idaho has a population of 14,715 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 22nd-largest county in Idaho. Population density is 22 people per square mile.
The population of Franklin County has grown 22.3% since 2010 (12,782 → 15,638), a +1.45% annualized rate.
The median household income in Franklin County, Idaho is $65,991, with mean (average) household income of $91,877 and per-capita income of $30,698. 5.4% of residents live below the federal poverty level.
In Franklin County, the largest racial and ethnic groups are White (91.9%), Hispanic or Latino (2.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Franklin County, Idaho is 32.5 years. Residents are 48.4% female and 51.6% male.
The median home value in Franklin County is $304,000 and median monthly rent is $831. 75.2% of occupied housing units are owner-occupied. The county has 5,122 total housing units, 4.9% of which are vacant.
The largest employment sector in Franklin County, Idaho is manufacturing, employing 21.2% of workers. The unemployment rate is 1.1%.
Boise City is among the largest cities associated with Franklin County, Idaho, with a population of 235,701.
Franklin County, ID Climate
Franklin County, ID has an average annual temperature of 7°C (45°F) and receives about 402 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
7°C
Avg Temp
402
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -6° / 20° | 33 mm |
| February | -4° / 26° | 30 mm |
| March | 2° / 35° | 38 mm |
| April | 6° / 43° | 37 mm |
| May | 11° / 52° | 52 mm |
| June | 16° / 61° | 31 mm |
| July | 20° / 69° | 26 mm |
| August | 20° / 68° | 25 mm |
| September | 15° / 58° | 33 mm |
| October | 8° / 47° | 37 mm |
| November | 1° / 33° | 31 mm |
| December | -5° / 22° | 29 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Franklin County, ID
The most comfortable months to visit Franklin County, ID are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -12°C low). May is usually the wettest month.
Where to stay near Franklin County
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Population, race, income, age, and trends across Idaho
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.