Demographics of Madison County, Idaho

Madison County, Idaho had 55,172 people on July 1, 2025, by the Census Bureau’s estimate: +2,222 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Madison County, in four figures

55,172
Population: July 1, 2025, Vintage 2025 estimate.; +4.2%
Change since July 2020: +2,222 people.; 21.4 ±0.2
Median age: ACS 2020–⁠2024.; $60,160 ±$6,493
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Madison County, Idaho's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Madison County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Madison County, Idaho's population grew 4.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Madison County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	52,950	100.0	100.0
2021	54,126	102.2	100.2
2022	55,251	104.3	100.7
2023	54,819	103.5	101.6
2024	54,948	103.8	102.5
2025	55,172	104.2	103.1

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Population of Madison County, Idaho on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	52,950	+37	+233	−2	−201
2021	54,126	+1,176	+877	+20	+249
2022	55,251	+1,125	+899	+418	−151
2023	54,819	−432	+866	+396	−1,727
2024	54,948	+129	+812	+408	−1,099
2025	55,172	+224	+819	+186	−775

Age, 2020–2024

The median age is 21.4 ±0.2: for men 22.5 ±0.4 and for women 20.4 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Madison County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	3,711 ±44	6.8% ±0.1	5.9% ±<0.1	5.6% ±<0.1
5 to 17	7,343 ±365	13.4% ±0.7	18.2% ±0.2	16.3% ±<0.1
18 to 24	25,147 ±896	46.0% ±1.6	9.8% ±0.1	9.1% ±<0.1
25 to 44	10,551 ±422	19.3% ±0.8	26.1% ±0.2	26.9% ±<0.1
45 to 64	4,921 ±301	9.0% ±0.6	23.0% ±0.2	24.8% ±<0.1
65 and over	2,945 ±236	5.4% ±0.4	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $60,160 ±$6,493, and income per person $23,958 ±$3,692, in 2024 dollars. The median is $77,800 ±$743 in Idaho and $80,734 ±$166 in the United States.

Households by income

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Households in Madison County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	2,159 ±448	16.2% ±3.3	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	3,409 ±831	25.6% ±6.2	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	2,646 ±523	19.9% ±3.9	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	1,696 ±459	12.7% ±3.4	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	1,946 ±306	14.6% ±2.2	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	542 ±163	4.1% ±1.2	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	928 ±190	7.0% ±1.4	9.2% ±0.3	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Madison County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	10,555 ±1,303	24.5% ±3.0	10.6% ±0.3	12.5% ±0.1
Under 18	1,743 ±307	15.9% ±2.7	12.4% ±0.5	16.1% ±0.1
18 to 59	8,418 ±1,146	30.0% ±3.7	10.4% ±0.3	11.6% ±0.1
60 and over	394 ±156	9.7% ±3.8	9.1% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Madison County, ACS 2020–2024
Measure	Madison County	Idaho	United States
Housing units	15,145 ±97	795,014 ±223	143,775,355 ±10,234
Occupied	88.0% ±2.6	89.7% ±0.3	89.9% ±0.1
Vacant	12.0% ±2.7	10.3% ±0.3	10.1% ±0.1
Owner occupied	40.2% ±2.6	72.1% ±0.4	65.2% ±0.3
Renter occupied	59.8% ±3.6	27.9% ±0.4	34.8% ±0.1
Median home value	$414,800 ±$21,710	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$1,014 ±$48	$1,238 ±$16	$1,413 ±$2
Median year built	2002 ±2	1991 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Madison County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	5,369 ±0	9.8% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	45,595 ±504	83.5% ±0.9	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	542 ±165	1.0% ±0.3	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	816 ±140	1.5% ±0.3	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	13 to 251	< 0.1% to 0.5%	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	157 ±61	0.3% ±0.1	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 963	0% to 1.8%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,537 ±352	2.8% ±0.6	4.2% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Madison County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	21,208 ±1,337	38.8% ±2.4	43.9% ±0.3	57.3% ±<0.1
Born in another state	30,272 ±1,467	55.4% ±2.7	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	125 to 419	0.2% to 0.8%	1.0% ±0.1	1.7% ±<0.1
Born abroad	2,866 ±808	5.2% ±1.5	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	496 ±138	0.9% ±0.3	2.7% ±0.1	7.4% ±<0.1
Not citizens	2,370 ±784	4.3% ±1.4	3.2% ±0.2	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Madison County among the counties of Idaho

7th of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Madison County in population, July 2025
County	July 2025	Change since 2020
Canyon County	275,123	+18.1%
Kootenai County	191,864	+11.0%
Bonneville County	135,771	+8.9%
Twin Falls County	97,539	+7.9%
Bannock County	91,591	+4.9%
Madison County	55,172	+4.2%
Bonner County	54,420	+14.8%
Bingham County	51,153	+6.4%
Nez Perce County	42,905	+1.8%
Latah County	41,842	+5.6%
Jefferson County	35,297	+13.6%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026