• county
  • FIPS 16059
  • Largest town: Salmon

Lemhi County, Idaho

Lemhi County had 8,397 residents in the Census Vintage 2024 estimate, on 4,563.7 square miles of land. It ranks 33rd of 44 in Idaho by population and 4th by land area.

Population
8,397
#33 of 44 in Idaho · #2,547 in US
Area
4,563.7 sq mi
#4 of 44 in Idaho · #96 in US
Density
1.8 / sq mi
#39 of 44 in Idaho · #3,000 in US
Median household income
$57,562
#40 of 44 in Idaho · #2,080 in US

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

Lemhi County within Idaho. Pin: Boise.

Measure from here

Tools and pages that start from Lemhi County

Lemhi County population, land area and income

Lemhi County had 8,397 residents in the Census Vintage 2024 estimate, on 4,563.7 square miles of land. It ranks 33rd of 44 in Idaho by population and 4th by land area. That works out to 1.8 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; Lemhi County is somewhat smaller.

Its SAIPE 2023 median household income of $57,562 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

8,397

3144th1st

2547th of 3,144 (US)

Land area

4,564 sq mi

3144th1st

96th of 3,144 (US)

Density

1.8 / sq mi

3144th1st

3000th of 3,144 (US)

Median household income

$57,562

3143rd1st

2080th of 3,143 (US)

Rank within Idaho (44)

Population

8,397

44th1st

33rd of 44 (ID)

Land area

4,564 sq mi

44th1st

4th of 44 (ID)

Density

1.8 / sq mi

44th1st

39th of 44 (ID)

Median household income

$57,562

44th1st

40th of 44 (ID)

How Lemhi County's population changed since 2020

Lemhi County gained 439 residents between the July 2020 and July 2024 estimates, a rise of 5.5%. That ranks 33rd 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, Lemhi County recorded 249 births and 542 deaths, a natural change of -293. Net international migration added +21 and net domestic migration, people moving to or from other US counties, came to +701. The largest single component was domestic migration, which added 701 people.

7,95820208,15820218,28620228,44720238,3972024
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
249
Deaths
542
Net international migration
+21
Net domestic migration
+701
Change, July 2023 to July 2024
-50

Where Lemhi County is

The Census internal point of Lemhi County is at 44.928500, -113.887000. It sits in UTM zone 12N. The map shades Idaho's 44 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Lemhi 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: Lemhi County internal point. Dark pin: Boise.

Internal point

Decimal
44.928500, -113.887000
DMS
44°55'42.60"N 113°53'13.20"W
UTM
12N 272177.1E 4979063.0N
Geohash
9rzp86yp2
Plus code
85P8W4H7+C6

Towns in Lemhi County

One incorporated place of 1,000+ people has residents in Lemhi County, 3,257 people together, or 39% of the county. Each figure counts only the part of the town inside Lemhi County; towns marked "part" extend into another county. The largest is Salmon with 3,257.

  1. 01Salmon3,257
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Lemhi County

The Census 2024 county adjacency file lists 7 neighbors for Lemhi County, including 2 across a state line. The most populous is Ravalli County, MT, with 48,187 residents. Distances run between Census internal points in a straight line.

Distance to Boise and the nearest big city

Boise is 146.5 miles SW of Lemhi County's internal point in a straight line. The nearest place of 100,000 or more is Boise City, ID (population 237,963), 147.9 miles away. The nearest place of 10,000 or more is Butte-Silver Bow, MT (population 35,480), 89.5 miles away.

Lemhi County FIPS code

The FIPS code of Lemhi County is 16059: state code 16 for Idaho plus county code 059. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $57,562.

Questions people ask

What is the population of Lemhi County, Idaho?

The Census Vintage 2024 estimate for July 1, 2024 is 8,397. That is up 439 people (5.5%) from the July 2020 estimate of 7,958.

What is the FIPS code of Lemhi County?

16059. The first two digits (16) are Idaho; the last three (059) identify the county.

What is the largest town in Lemhi County?

Salmon, with 3,257 residents inside Lemhi County in 2024.

Which counties border Lemhi County?

7 county-equivalents border it in the Census 2024 adjacency file: Ravalli County, MT; Idaho County, ID; Valley County, ID; Beaverhead County, MT; Custer County, ID; Butte County, ID; Clark 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.