Custer County, Idaho Demographics 2026

Population Overview

Custer County is located in Idaho with a total population of 4,411. It is the 40th most populous county out of 44 in Idaho.

Age Demographics

The median age in Custer County is 59.5 years. This is 60% higher than the state median of 37.1 years. Only 11.1% of residents are under 18, indicating fewer families with children. 13.9% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Custer County is $56,957. This is 24% lower than the state median of $74,636. Compared to the national median of $78,538, household income here is 27% lower. The poverty rate stands at 11.6%. This is 9% higher than the state poverty rate of 10.6%. The unemployment rate is 2.1%. This is 42% lower than the state rate of 3.7%. The median home value is $295,600. Housing costs are 21% lower than the state median of $376,000. The home-value-to-income ratio is 5.2x. 77.6% of occupied housing units are owner-occupied. This homeownership rate is 7% higher than the state average of 72.4%.

Race & Ethnicity

Custer County has a predominantly White (non-Hispanic) population, comprising 89.4% of all residents. Hispanic or Latino residents account for 3.0%. The Black or African American population (0.3%) is well below the state average of 0.7%. The Hispanic or Latino population (3.0%) is well below the state average of 13.3%. The Asian population is significantly higher than the state average (2.6% vs 1.3%).

Education

25.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 19% lower than the state rate of 31.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.6%.