Clark County, Idaho Demographics 2026

Population Overview

Clark County is located in Idaho with a total population of 849. It is the 44th most populous county out of 44 in Idaho. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Clark County is 31.1 years. This is 17% lower than the state median of 37.3 years. With 28.5% of the population under 18, Clark County has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Clark County is $55,208. This is 29% lower than the state median of $77,800. It is also 32% lower than the national median of $80,734. The poverty rate stands at 11.7%. This is 11% higher than the state poverty rate of 10.6%. The unemployment rate is 2.1%. This is 44% lower than the state rate of 3.7%. The median home value is $216,900. Housing costs are 48% lower than the state median of $418,600. The home-value-to-income ratio is 3.9x. 61.3% of occupied housing units are owner-occupied. This homeownership rate is 15% lower than the state average of 72.1%.

Race & Ethnicity

The largest racial or ethnic group in Clark County is White (non-Hispanic), making up 63.1% of the population. Hispanic or Latino residents account for 28.7%. The Hispanic or Latino population is significantly higher than the state average (28.7% vs 13.7%).

Education

20.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 36% lower than the state rate of 31.8%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 74.4%.

Data Sources & Methodology

All figures for Clark County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Idaho and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.