• county
  • FIPS 16061
  • Largest town: Kamiah

Lewis County, Idaho

Lewis County had 3,728 residents in the Census Vintage 2024 estimate, on 478.8 square miles of land. It ranks 41st of 44 in Idaho by population and 41st by land area.

Population
3,728
#41 of 44 in Idaho · #2,904 in US
Area
478.8 sq mi
#41 of 44 in Idaho · #2,160 in US
Density
7.8 / sq mi
#26 of 44 in Idaho · #2,651 in US
Median household income
$53,212
#44 of 44 in Idaho · #2,467 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Lewis County within Idaho. Pin: Boise.

Measure from here

Tools and pages that start from Lewis County

Lewis County population, land area and income

Lewis County had 3,728 residents in the Census Vintage 2024 estimate, on 478.8 square miles of land. It ranks 41st of 44 in Idaho by population and 41st by land area. That works out to 7.8 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Idaho has 15,019 residents, so Lewis County has 25% of the typical county's population.

Its SAIPE 2023 median household income of $53,212 is in the bottom quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

3,728

3144th1st

2904th of 3,144 (US)

Land area

479 sq mi

3144th1st

2160th of 3,144 (US)

Density

7.8 / sq mi

3144th1st

2651st of 3,144 (US)

Median household income

$53,212

3143rd1st

2467th of 3,143 (US)

Rank within Idaho (44)

Population

3,728

44th1st

41st of 44 (ID)

Land area

479 sq mi

44th1st

41st of 44 (ID)

Density

7.8 / sq mi

44th1st

26th of 44 (ID)

Median household income

$53,212

44th1st

44th of 44 (ID)

How Lewis County's population changed since 2020

Lewis County gained 204 residents between the July 2020 and July 2024 estimates, a rise of 5.8%. That ranks 32nd of 44 in Idaho for growth. The median Idaho county changed by +7.2%, and the state as a whole by +8.2%.

Since the April 2020 estimates base, Lewis County recorded 155 births and 248 deaths, a natural change of -93. Net international migration added +4 and net domestic migration, people moving to or from other US counties, came to +302. The largest single component was domestic migration, which added 302 people.

3,52420203,68920213,72720223,74020233,7282024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
155
Deaths
248
Net international migration
+4
Net domestic migration
+302
Change, July 2023 to July 2024
-12

Where Lewis County is

The Census internal point of Lewis County is at 46.236300, -116.423800. It sits in UTM zone 11N. The map shades Idaho's 44 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Lewis County outlined. Dots are towns of 1,000+ people with residents in it.

Madison County: +5.0%Idaho County: +8.0%Benewah County: +9.9%Gooding County: +3.4%Lincoln County: +8.2%Minidoka County: +4.7%Custer County: +7.7%Boundary County: +15.6%Lemhi County: +5.5%Twin Falls County: +6.8%Franklin County: +9.5%Oneida County: +9.0%Gem County: +13.4%Shoshone County: +6.6%Fremont County: +7.3%Clearwater County: +4.6%Kootenai County: +9.0%Cassia County: +4.9%Blaine County: +3.8%Clark County: +0.1%Jerome County: +7.4%Bonner County: +13.8%Elmore County: +3.7%Caribou County: +3.2%Bonneville County: +7.1%Jefferson County: +12.1%Power County: +6.3%Lewis County: +5.8%Nez Perce County: +1.7%Ada County: +7.5%Adams County: +12.9%Valley County: +7.9%Bingham County: +5.8%Bannock County: +4.3%Owyhee County: +6.2%Washington County: +9.3%Latah County: +6.4%Teton County: +10.2%Camas County: +15.0%Boise County: +12.0%Bear Lake County: +6.5%Butte County: +5.9%Canyon County: +14.5%Payette County: +8.1%
Change 2020 to 2024
  1. < +4.7%
  2. < +6.4%
  3. < +7.7%
  4. < +9.9%
  5. ≥ +9.9%
no data

Orange pin: Lewis County internal point. Dark pin: Boise.

Internal point

Decimal
46.236300, -116.423800
DMS
46°14'10.68"N 116°25'25.68"W
UTM
11N 544426.2E 5120463.9N
Geohash
c2jpn9ncb
Plus code
85R56HPG+GF

Towns in Lewis County

One incorporated place of 1,000+ people has residents in Lewis County, 1,155 people together, or 31% of the county. Each figure counts only the part of the town inside Lewis County; towns marked "part" extend into another county. The largest is Kamiah with 1,155.

  1. 01Kamiah (part)1,155
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Lewis County

The Census 2024 county adjacency file lists 3 neighbors for Lewis County. The most populous is Nez Perce County, ID, with 42,847 residents. Distances run between Census internal points in a straight line.

Distance to Boise and the nearest big city

Boise is 181.2 miles S of Lewis County's internal point in a straight line. The nearest place of 100,000 or more is Spokane Valley, WA (population 108,267), 105.8 miles away. The nearest place of 10,000 or more is Lewiston, ID (population 34,693), 29.3 miles away.

Lewis County FIPS code

The FIPS code of Lewis County is 16061: state code 16 for Idaho plus county code 061. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $53,212.

Questions people ask

What is the population of Lewis County, Idaho?

The Census Vintage 2024 estimate for July 1, 2024 is 3,728. That is up 204 people (5.8%) from the July 2020 estimate of 3,524.

What is the FIPS code of Lewis County?

16061. The first two digits (16) are Idaho; the last three (061) identify the county.

What is the largest town in Lewis County?

Kamiah, with 1,155 residents inside Lewis County in 2024 (1,163 across all 2 counties it spans).

Which counties border Lewis County?

3 county-equivalents border it in the Census 2024 adjacency file: Nez Perce County, ID; Idaho County, ID; Clearwater County, ID.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.