Adams County, Idaho

Adams County population, land area and income

Adams County had 4,998 residents in the Census Vintage 2024 estimate, on 1,362.8 square miles of land. It ranks 38th of 44 in Idaho by population and 22nd by land area. That works out to 3.7 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 Adams County has 33% of the typical county's population.

Its SAIPE 2023 median household income of $59,829 is below the national county median among 3,143 counties with an estimate.

How Adams County's population changed since 2020

Adams County gained 573 residents between the July 2020 and July 2024 estimates, a rise of 12.9%. That ranks 6th 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, Adams County recorded 141 births and 242 deaths, a natural change of -101. Net international migration added +18 and net domestic migration, people moving to or from other US counties, came to +710. The largest single component was domestic migration, which added 710 people.

Where Adams County is

The Census internal point of Adams County is at 44.877000, -116.461600. 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 Adams County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Adams County

No incorporated place of 1,000 or more people has residents in Adams County. Its 4,998 residents live in smaller towns, census-designated places, or unincorporated land, which the subcounty estimates do not list at this size.

Counties bordering Adams County

The Census 2024 county adjacency file lists 6 neighbors for Adams County, including 2 across a state line. The most populous is Gem County, ID, with 21,857 residents. Distances run between Census internal points in a straight line.

• Gem County

  21,857 people

  56 mi S

• Idaho County

  17,912 people

  83 mi NE

• OR

  Baker County, OR

  16,750 people

  62 mi W

• Valley County

  12,777 people

  41 mi E

• Washington County

  11,539 people

  34 mi SSW

• OR

  Wallowa County, OR

  7,522 people

  61 mi NW

Distance to Boise and the nearest big city

Boise is 87.8 miles S of Adams County's internal point in a straight line. The nearest place of 100,000 or more is Meridian, ID (population 139,740), 87.5 miles away. The nearest place of 10,000 or more is Ontario, OR (population 11,957), 64.1 miles away.

Adams County FIPS code

The FIPS code of Adams County is 16003: state code 16 for Idaho plus county code 003. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $59,829.