Idaho County, Idaho

Idaho County population, land area and income

Idaho County had 17,912 residents in the Census Vintage 2024 estimate, on 8,477.5 square miles of land. It is the largest by land of Idaho's 44 county-equivalents. That works out to 2.1 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; Idaho County is somewhat larger.

Its SAIPE 2023 median household income of $57,210 is below the national county median among 3,143 counties with an estimate.

How Idaho County's population changed since 2020

Idaho County gained 1,322 residents between the July 2020 and July 2024 estimates, a rise of 8.0%. That ranks 17th 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, Idaho County recorded 674 births and 987 deaths, a natural change of -313. Net international migration added +65 and net domestic migration, people moving to or from other US counties, came to +1,622. The largest single component was domestic migration, which added 1,622 people.

Where Idaho County is

The Census internal point of Idaho County is at 45.849600, -115.467300. 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 Idaho County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Idaho County

2 incorporated places of 1,000+ people have residents in Idaho County, 3,635 people together, or 20% of the county. Each figure counts only the part of the town inside Idaho County; towns marked "part" extend into another county. The largest is Grangeville with 3,627.

Counties bordering Idaho County

The Census 2024 county adjacency file lists 9 neighbors for Idaho County, including 3 across a state line. The most populous is Missoula County, MT, with 122,546 residents. Distances run between Census internal points in a straight line.

• MT

  Missoula County, MT

  122,546 people

  111 mi NE

• MT

  Ravalli County, MT

  48,187 people

  67 mi ENE

• Nez Perce County

  42,847 people

  70 mi WNW

• Valley County

  12,777 people

  69 mi S

• Clearwater County

  9,151 people

  58 mi N

• Lemhi County

  8,397 people

  100 mi SE

• OR

  Wallowa County, OR

  7,522 people

  85 mi WSW

• Adams County

  4,998 people

  83 mi SW

• Lewis County

  3,728 people

  53 mi WNW

Distance to Boise and the nearest big city

Boise is 158.5 miles SSW of Idaho County's internal point in a straight line. The nearest place of 100,000 or more is Spokane Valley, WA (population 108,267), 150.6 miles away. The nearest place of 10,000 or more is Lewiston, ID (population 34,693), 82.1 miles away.

Idaho County FIPS code

The FIPS code of Idaho County is 16049: state code 16 for Idaho plus county code 049. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $57,210.