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 skews on age — the median resident is 21.4, younger than the national median. Madison County is a county in Idaho with a population of 53,578. It is the #7-largest of all counties in Idaho nationally.
Median household income is $58,259, below the US median of $78,538. The poverty rate is 13.3%, above the national 12.4%. Home prices are steep, with the typical property valued at $365,000, with typical rent around $965.
The population is unusually well-credentialed for US counties — 40.3% of adults have a four-year degree, above the national 35.0%. A solid 11.6% of workers are based at home, below the national 14.0%, and the average commute runs about 17 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.
Madison County, ID Climate
Madison County, ID has an average annual temperature of 5.3°C (42°F) and receives about 427 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
5.3°C
Avg Temp
427
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 19° | 39 mm |
| February | -5° / 24° | 31 mm |
| March | 0° / 31° | 29 mm |
| April | 5° / 40° | 35 mm |
| May | 10° / 50° | 53 mm |
| June | 14° / 57° | 44 mm |
| July | 17° / 63° | 25 mm |
| August | 17° / 63° | 26 mm |
| September | 13° / 55° | 31 mm |
| October | 7° / 45° | 33 mm |
| November | -1° / 31° | 41 mm |
| December | -6° / 21° | 40 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 Madison County, ID
The most comfortable months to visit Madison County, ID are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 27°C high). The coldest is January (near -12°C low). May is usually the wettest month.
Where to stay near Madison 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.