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.

Franklin County within Idaho · Source: US Census TIGER/Line via us-atlas

14,715

Population

+1.45%

Annual growth

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 a county in Idaho with a population of 14,715. It ranks #22 among counties in Idaho by population. The median age is 32.5, younger than the national median. The population is 51.6% male and 48.4% female.

The median household income in Franklin County is $65,991, below the US median of $74,580. 5.4% of residents live below the federal poverty level. Home values sit at a median of $304,000, with monthly rent averaging $831. The homeownership rate of 75.2% is higher than the national rate of 64.8%.

Educational attainment in Franklin County reflects 21.5% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 11.3% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 25.3 minutes each way.

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	Change	Annual %	Source
2010	12,782	-	-	estimate
2011	12,813	+31	+0.24%	estimate
2012	12,801	-12	-0.09%	estimate
2013	12,809	+8	+0.06%	estimate
2014	12,924	+115	+0.90%	estimate
2015	12,974	+50	+0.39%	estimate
2016	13,345	+371	+2.86%	estimate
2017	13,501	+156	+1.17%	estimate
2018	13,718	+217	+1.61%	estimate
2019	13,898	+180	+1.31%	estimate
2020	14,283	+385	+2.77%	estimate
2021	14,673	+390	+2.73%	estimate
2022	15,172	+499	+3.40%	estimate
2023	15,516	+344	+2.27%	estimate
2024	15,638	+122	+0.79%	estimate

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

Under 5

7.6%

5–9

9.0%

10–14

8.2%

15–19

8.9%

20–24

6.3%

25–34

12.0%

35–44

12.5%

45–54

10.8%

55–59

4.2%

60–64

6.4%

65–74

8.2%

75–84

4.1%

85+

1.9%

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

Manufacturing

21.2%

Professional & business services

17.2%

Construction

10.7%

Education & health care

9.6%

Retail trade

7.2%

Agriculture

6.6%

Finance & real estate

5.4%

Public administration

4.3%

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

Boise City (235,701)Meridian (124,865)Nampa (106,289)Idaho Falls (66,672)Caldwell (63,465)Pocatello (57,152)Coeur d'Alene (55,558)Twin Falls (53,219)Post Falls (41,716)Rexburg (39,589)All Idaho cities →

Other counties in Idaho

Ada County (508,052)Canyon County (242,405)Kootenai County (177,736)Bonneville County (127,056)Twin Falls County (92,121)Bannock County (88,457)Madison County (53,578)Bonner County (49,456)Bingham County (48,993)Nez Perce County (42,477)All Idaho counties →

Part of Idaho

Idaho demographic profile All Idaho data →

Metro areas in Idaho

Boise City (790,640)Coeur d'Alene (177,736)Idaho Falls (161,944)Logan (151,746)Twin Falls (116,909)Pocatello (88,457)Lewiston (64,901)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All 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.