County · Idaho
Lewis County, Idaho
Lewis County, Idaho. Lewis County had 3,704 residents in 2025 by the Census Bureau's estimate, up 4.8% since 2020, slower than Idaho (+10.4%). It holds 5 places (5 cities, villages and boroughs) and 3 census tracts. GEOID 16061.
Residents, July 2025 estimate
3,704
Census Bureau estimate (no margin published)
2020 Census count: 3,533 · ACS 2020-2024: 3,682
Median household income
$51,615
±$3,542 (90% margin)
Idaho: $77,800
Median home value
$225,300
±$13,711 (90% margin)
Idaho: $418,600
Median gross rent
$737
±$34 (90% margin)
Idaho: $1,238
How many people live in Lewis County, and is it growing?
The 2020 Census counted 3,533 residents in Lewis County. The Census Bureau estimates 3,704 for July 1, 2025, up 4.8% since 2020, slower than Idaho (+10.4%). The 2020-2024 American Community Survey puts the population at 3,682 over 479 square miles of land.
| Measure | Lewis County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Total population | 3,682 | 1,934,262 | −156 |
| Households | 1,574±45 | 713,005 | −72 |
| Average household size | 2.28±0.06 | 2.64 | no clear change |
| Housing units | 1,826±31 | 795,014 | −122 |
Lewis County's population since 2000
From 3,747 in 2000 to 3,704 in 2025: down 1.1%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Lewis County?
Lewis County holds 5 places: 5 cities, villages and boroughs (incorporated places). The largest is Kamiah with 1,134 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Kamiah | 1,117 | $36,071 |
|---|---|---|
| Nezperce | 458 | $62,857 |
| Craigmont | 458 | $60,000 |
| Winchester | 356 | $45,208 |
| ReubensGEOID 1667150 | 46 | $76,250 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Lewis County?
The median resident of Lewis County is 49.0 years old; 21.9% are under 18 and 28.3% are 65 or older. The largest group is non-Hispanic white residents at 81.7%, then non-Hispanic residents of two or more races at 9.7%. 1.2% of residents were born outside the United States.
| Measure | Lewis County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median age | 49.0±1.2 | 37.3 | no clear change |
| Under 18 years | 21.9%±0.5 pts | 24.1% | – |
| 65 years and over | 28.3%±0.6 pts | 17.0% | – |
| Hispanic or Latino (any race) | 4.3% | 13.6% | −0.3 pts |
| White alone, not Hispanic | 81.7%±1.2 pts | 78.6% | −2.1 pts |
| Black or African American alone, not Hispanic | 1.1%±0.2 pts | 0.7% | – |
| Asian alone, not Hispanic | 1.0%±0.5 pts | 1.3% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 1.3%±0.6 pts | 0.7% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.9 pts | 0.1% | – |
| Two or more races, not Hispanic | 9.7%±1.0 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.9%±1.0 pts | 0.6% | – |
| Born outside the United States | 1.2%±0.6 pts | 5.9% | −1.0 pts |
| Speak a language other than English at home (age 5+) | 3.8%±1.4 pts | 11.0% | – |
| Civilian veterans (age 18+) | 10.8%±1.6 pts | 8.0% | – |
| With a disability | 24.0%±2.3 pts | 14.1% | – |
| No health insurance coverage | 11.1%±2.6 pts | 9.1% | −4.0 pts |
| High school graduate or higher (age 25+) | 91.4%±2.2 pts | 91.9% | – |
| Bachelor's degree or higher (age 25+) | 21.3%±2.7 pts | 31.8% | no clear change |
| Graduate or professional degree (age 25+) | 7.3%±2.0 pts | 10.5% | – |
| Moved from another state in the past year | 3.2%±1.3 pts | 4.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Lewis County earn?
Half of Lewis County's 1,574 households earn less than $51,615 a year (±$3,542), against $77,800 in Idaho. In 2015-2019 it was $50,702 in 2024 dollars; the margins of error cannot tell the two periods apart. 15.3% of residents live below the poverty line.
| Measure | Lewis County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $51,615±$3,542 | $77,800 | no clear change |
| Mean household income | $73,126±$6,497 | $102,747 | – |
| Per capita income | $31,902±$2,732 | $38,952 | no clear change |
| People below the poverty line | 15.3%±2.5 pts | 10.6% | no clear change |
| Children under 18 below the poverty line | 17.6%±4.9 pts | 12.4% | no clear change |
| Households receiving SNAP | 9.8%±2.2 pts | 7.6% | – |
| Households with a broadband subscription | 81.9%±3.3 pts | 91.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Lewis County?
Owners occupy 76.4% of Lewis County's occupied homes and renters 23.6%. The median owner-occupied home is valued at $225,300 by its owner (±$13,711). The median renter pays $737 a month including utilities, and 18.6% of renters pay 35% or more of their income on rent.
| Measure | Lewis County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $225,300±$13,711 | $418,600 | +$62,479 |
| Median gross rent | $737±$34 | $1,238 | no clear change |
| Renters paying 35% or more of income on rent | 18.6%±6.1 pts | 36.9% | −13.9 pts |
| Median monthly owner costs, with a mortgage | $1,300±$78 | $1,687 | – |
| Owner-occupied homes | 76.4%±3.0 pts | 72.1% | +7.0 pts |
| Housing units | 1,826±31 | 795,014 | −122 |
| Homeowner vacancy rate | 2.2%±1.2 pts | 0.7% | – |
| Rental vacancy rate | 4.1%±3.1 pts | 3.9% | – |
| Single-family detached homes | 79.4%±2.5 pts | 73.8% | – |
| Mobile homes | 12.5%±2.4 pts | 6.9% | – |
| Built 2020 or later | 0.5%±0.4 pts | 3.9% | – |
| Built 1939 or earlier | 26.7%±3.6 pts | 7.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Lewis County building?
Builders took permits for 41 new housing units across Lewis County in 2025 (29 single-family), 11.1 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Lewis County get to work?
73.6% of Lewis County's workers drive alone and 12.6% work from home. The average trip to work takes 21.4 minutes. The unemployment rate in 2020-2024 averaged 2.4%.
| Measure | Lewis County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 47.6%±2.3 pts | 63.0% | – |
| Unemployment rate | 2.4%±1.2 pts | 3.7% | −3.6 pts |
| Drove alone to work | 73.6%±4.2 pts | 72.7% | – |
| Carpooled | 8.8%±2.4 pts | 8.9% | – |
| Public transportation | 0.0%±2.6 pts | 0.5% | – |
| Walked | 3.7%±1.4 pts | 2.6% | – |
| Worked from home | 12.6%±2.8 pts | 13.3% | +7.1 pts |
| Mean travel time to work | 21.4 min±1.7 | 21.6 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Lewis County's census tracts?
Lewis County is divided into 3 census tracts. Among those with a reliable estimate, median household income runs from $40,347 (Tract 9400.01) to $62,212 (Tract 9400.02).
| Tract 9400.0116061940001 | 1,535±95 | $40,347 |
|---|---|---|
| Tract 9400.0216061940002 | 2,118±92 | $62,212 |
| Tract 950316061950300 | 29±30 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Lewis County compare with Idaho's other counties?
| Measure | Rank |
|---|---|
| Population | 41st of 44 |
| Growth 2020-2025 | 37th of 44 |
| Residents per square mile | 25th of 44 |
| Median household income | 44th of 44 |
| Median home value | 41st of 44 |
| Median gross rent | 41st of 44 |
| Poverty rate | 6th of 43 |
| Bachelor's degree or higher | 28th of 44 |
| Median age | 7th of 44 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Lewis County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.