Demographics of Lewis County, Idaho

Lewis County, Idaho had 3,704 people on July 1, 2025, by the Census Bureau’s estimate: +170 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.

Lewis County, in four figures

3,704
Population: July 1, 2025, Vintage 2025 estimate.; +4.8%
Change since July 2020: +170 people.; 49.0 ±1.2
Median age: ACS 2020–⁠2024.; $51,615 ±$3,542
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.

Lewis County, Idaho's population grew 4.8% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Lewis 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

Lewis County, Idaho's population grew 4.8% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Lewis 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	3,534	100.0	100.0
2021	3,704	104.8	100.2
2022	3,741	105.9	100.7
2023	3,743	105.9	101.6
2024	3,713	105.1	102.5
2025	3,704	104.8	103.1

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Population of Lewis 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	3,534	+1	+1	0	+1
2021	3,704	+170	−22	0	+202
2022	3,741	+37	−33	+4	+66
2023	3,743	+2	−37	0	+36
2024	3,713	−30	−30	0	+1
2025	3,704	−9	−29	0	+20

Age, 2020–2024

The median age is 49.0 ±1.2: for men 50.0 ±3.2 and for women 48.7 ±1.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Lewis County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	197 ±22	5.4% ±0.6	5.9% ±<0.1	5.6% ±<0.1
5 to 17	611 ±44	16.6% ±1.2	18.2% ±0.2	16.3% ±<0.1
18 to 24	185 ±33	5.0% ±0.9	9.8% ±0.1	9.1% ±<0.1
25 to 44	719 ±55	19.5% ±1.5	26.1% ±0.2	26.9% ±<0.1
45 to 64	927 ±61	25.2% ±1.7	23.0% ±0.2	24.8% ±<0.1
65 and over	1,043 ±88	28.3% ±2.4	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $51,615 ±$3,542, and income per person $31,902 ±$2,732, 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 Lewis County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	348 ±64	22.1% ±4.0	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	408 ±63	25.9% ±4.0	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	301 ±46	19.1% ±2.9	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	174 ±38	11.1% ±2.4	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	217 ±39	13.8% ±2.5	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	90 ±26	5.7% ±1.6	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	36 ±14	2.3% ±0.9	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 Lewis County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	560 ±91	15.3% ±2.5	10.6% ±0.3	12.5% ±0.1
Under 18	141 ±36	17.6% ±4.3	12.4% ±0.5	16.1% ±0.1
18 to 59	194 ±45	13.3% ±3.0	10.4% ±0.3	11.6% ±0.1
60 and over	225 ±61	16.0% ±4.2	9.1% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Lewis County, ACS 2020–2024
Measure	Lewis County	Idaho	United States
Housing units	1,826 ±31	795,014 ±223	143,775,355 ±10,234
Occupied	86.2% ±2.0	89.7% ±0.3	89.9% ±0.1
Vacant	13.8% ±1.8	10.3% ±0.3	10.1% ±0.1
Owner occupied	76.4% ±2.3	72.1% ±0.4	65.2% ±0.3
Renter occupied	23.6% ±3.2	27.9% ±0.4	34.8% ±0.1
Median home value	$225,300 ±$13,711	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$737 ±$34	$1,238 ±$16	$1,413 ±$2
Median year built	1965 ±4	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 Lewis County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	158 ±0	4.3% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,008 ±44	81.7% ±1.2	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	42 ±8	1.1% ±0.2	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	37 ±18	1.0% ±0.5	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	24 to 72	0.7% to 2.0%	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 12	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 69	0% to 1.9%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	356 ±37	9.7% ±1.0	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 Lewis County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	1,805 ±98	49.0% ±2.7	43.9% ±0.3	57.3% ±<0.1
Born in another state	1,762 ±103	47.9% ±2.8	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	72 ±31	2.0% ±0.8	1.0% ±0.1	1.7% ±<0.1
Born abroad	21 to 65	0.6% to 1.8%	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	10 to 48	0.3% to 1.3%	2.7% ±0.1	7.4% ±<0.1
Not citizens	1 to 27	< 0.1% to 0.7%	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%.

Lewis County among the counties of Idaho

41st of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Lewis County in population, July 2025
County	July 2025	Change since 2020
Bear Lake County	6,727	+5.7%
Lincoln County	5,603	+9.1%
Oneida County	5,085	+11.4%
Adams County	5,013	+13.3%
Custer County	4,636	+8.6%
Lewis County	3,704	+4.8%
Butte County	2,783	+7.8%
Camas County	1,316	+21.7%
Clark County	783	−1.0%

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