Lewis County, Idaho
Located in Idaho, Lewis County has a population of 3,682 residents and a median age of 49.0 years, making it the #2,987 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 15.3%. The median home value is $225,300, and the median household income is $51,615, which is 31% below the national median.
Demographics
Lewis County has a population of 3,682, making it the #2,987 most populous county in the US. The median age is 49.0 years, which is 26.0% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Lewis County is $51,615, ranking #2,684 out of 3,222 counties — 31.3% below the national median. The poverty rate is 15.3% and unemployment stands at 2.4%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Lewis County is $225,300 (-20.1% vs national). Renters pay a median of $737/mo and the homeownership rate is 76.4%.
Median Home Value Trend
Rankings →Household Type
Education
In Lewis County, 21.3% of adults age 25+ hold a bachelor's degree or higher, which is 36.9% below the national average, ranking #1,776 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Lewis County is 73.4 years. 19.4% of adults report poor or fair health and 11.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
18.0% of adults in Lewis County smoke , 36.2% are obese , and 17.9% report excessive drinking.
Adult Smoking Trend
Safety
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Families & Children
16.2% of children in Lewis County live in poverty . The teen birth rate is 14.6 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Lewis County is 63.2%. The mean commute time is 23.8 min, which is 13.8% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Lewis County voted Republican with a margin of 65.1%. The vote was 16.5% Dem / 81.6% Rep. Compared to 2020, the margin shifted 4.2 toward Republicans .
Vote Share Over Time
About Lewis County, Idaho
Lewis County, Idaho has a total population of 3,682, making it the 2,987th most populous county in the United States. The median age in Lewis County is 49.0 years, which is 26.0% above the national median of 38.9 years.
The median household income in Lewis County is $51,615, which ranks #2,684 of 3,222 counties nationwide. This is 31.3% below the national median of $75,149. The poverty rate is 15.3%, higher than the national rate of 12.6%. The unemployment rate stands at 2.4%.
The median home value in Lewis County is $225,300, 20.1% below the national median. Renters in Lewis County pay a median gross rent of $737 per month. The homeownership rate is 76.4%, compared to the national rate of 64.4%.
In Lewis County, 21.3% of residents aged 25 and older hold a bachelor's degree or higher, 36.9% below the national average of 33.7%. Health insurance coverage stands at 88.9% of the population. The average commute time for workers is 23.8 min.
Lewis County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 81.7% of the population, followed by Two or More Races (9.7%) and Hispanic or Latino (4.3%).
All data for Lewis County, Idaho comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.