Madison County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 7th-largest in Idaho
The population of Madison County, Idaho is 53,578 as of the 2023 American Community Survey, making it the 7th-largest county in Idaho. The median household income is $58,259, the median home value is $365,000, and the median age is 21.4.
The population of Madison County has grown 47.8% since 2010 (37,588 → 55,549), a +2.83% annualized rate.
53,578
Population
+2.83%
Annual growth
114
People / sq mi
$58,259
Median Income
$365,000
Median Home Value
Madison County covers 469 sq mi of land at 114.2 people per square mile.
About Madison County, ID
Madison County is a county in Idaho with a population of 53,578. It ranks #7 among counties in Idaho by population. The median age is 21.4, younger than the national median. The population is 45.2% male and 54.8% female.
The median household income in Madison County is $58,259, below the US median of $74,580. 13.3% of residents live below the federal poverty level. Home values sit at a median of $365,000, with monthly rent averaging $965. The homeownership rate of 40.2% is lower than the national rate of 64.8%.
Educational attainment in Madison County reflects 40.3% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 11.6% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 16.6 minutes each way.
Madison County Population History (2010-2024)
The county of Madison County had a population of 37,588 in 2010 and 55,549 in 2024, a 47.8% growth over 14 years. The peak was 55,549 in 2024. Average annual growth rate: 3.09%.
55,549
Population (2024)
37,588
Population (2010)
55,549
Peak (2024)
3.09%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 37,588 |
| 2011 | 37,937 |
| 2012 | 37,712 |
| 2013 | 37,607 |
| 2014 | 38,005 |
| 2015 | 38,120 |
| 2016 | 39,111 |
| 2017 | 39,540 |
| 2018 | 39,451 |
| 2019 | 40,205 |
| 2020 | 52,912 |
| 2021 | 54,079 |
| 2022 | 55,427 |
| 2023 | 55,123 |
| 2024 | 55,549 |
Race & Ethnicity
| White | 88.1% |
| Black or African American | 0.9% |
| Asian | 0.2% |
| Hispanic or Latino (any race) | 1.2% |
| Two or More Races | 0.2% |
Age & Sex
21.4
Median Age
54.8%
Female
45.2%
Male
5.3%
Age 65+
Age Distribution
Children (under 15): 16.9% · Seniors (65+): 5.3%
Income & Poverty
| Median household income | $58,259$-16,377 vs state |
| Mean household income | $89,770 |
| Per-capita income | $23,024 |
| Poverty rate | 13.3%+6.3% vs state |
| Unemployment rate | 6.0% |
| Employment-to-population | 62.5% |
Top Industries by Employment
The largest employment sector in Madison County is professional & business services, accounting for 32.0% of workers.
How residents commute
1.1%
Drive alone
12.2%
Carpool
59.2%
Public transit
11.6%
Work from home
16.6 min
Avg commute
Housing
$365,000$-11,000 vs state
Median home value
$965
Median rent
40.2%
Homeownership rate
14,769
Total housing units
86.5%
Occupied
13.5%
Vacant
59.8%
Renter-occupied
Social & access
94.7%
With health insurance
98.7%
With broadband internet
55.0%
Foreign-born
1.7%
Veterans (18+)
7.0%
With a disability
90.1%
Speak language other than English at home
Education
97.0%
High School+
40.3%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Madison County, Idaho has a population of 53,578 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 7th-largest county in Idaho. Population density is 114 people per square mile.
The population of Madison County has grown 47.8% since 2010 (37,588 → 55,549), a +2.83% annualized rate.
The median household income in Madison County, Idaho is $58,259, with mean (average) household income of $89,770 and per-capita income of $23,024. 13.3% of residents live below the federal poverty level.
In Madison County, the largest racial and ethnic groups are White (88.1%), Hispanic or Latino (1.2%), Black or African American (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Madison County, Idaho is 21.4 years. Residents are 54.8% female and 45.2% male.
The median home value in Madison County is $365,000 and median monthly rent is $965. 40.2% of occupied housing units are owner-occupied. The county has 14,769 total housing units, 13.5% of which are vacant.
The largest employment sector in Madison County, Idaho is professional, scientific, and management services, employing 32.0% of workers. The unemployment rate is 6.0%.
Boise City is among the largest cities associated with Madison County, Idaho, with a population of 235,701.
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Full rankings of Idaho counties
Statewide data for Idaho
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.