Idaho local data guide

Primary Age Demographics in Ada County, Idaho

As of 2024, Ada County maintains a balanced demographic profile with a median age of approximately 38.9 years. The county supports a diverse mix of generations, with significant segments of the population comprised of families with children and residents aged 65 and older.

Updated with grounded research as of 2026-09-05.

The short answer

The demographic landscape in Ada County reflects a community that is slightly older than the statewide average for Idaho but remains relatively young compared to national trends. With a median age of 38.9 years, the county serves as a major hub for both established professionals and families. As of 2024, the population distribution shows a stable mix of age groups, indicating a resilient workforce and an active retired community, which are critical factors for those considering real estate investment or relocation.

Key facts

Median Age (2024)
38.9 years
Residents Under 18 Years (2024)
21.1%
Residents 65 Years and Older (2024)
17.3%

Working-Age and Family Dynamics

A significant portion of Ada County's population consists of individuals in their peak working years and families raising children. The presence of approximately 112,900 residents under the age of 18 suggests a strong demand for suburban housing, quality school districts, and community infrastructure tailored to families. This segment is a primary driver of the local real estate market in areas surrounding Boise, Meridian, and Eagle.

The Senior Demographic

Ada County continues to attract retirees and older professionals, with residents aged 65 and older making up 17.3% of the total population—totaling approximately 92,600 individuals. This group's influence on the housing market is notable, often favoring single-level homes, planned communities, and proximity to healthcare services and amenities. Understanding this cohort is essential for long-term local planning and housing development.

Comparative Context

When compared to the broader Idaho state landscape, Ada County is home to a slightly older population. The county's median age of 38.9 years is higher than the statewide median of 37.8 years. This difference often reflects the county's status as an economic center, which attracts a diverse labor force, as well as its reputation as a desirable location for residents seeking a balance of urban amenities and outdoor lifestyle.

Common questions

How does Ada County's median age compare to the Idaho state average?

Ada County's median age of 38.9 years is slightly higher than the Idaho statewide median of 37.8 years, indicating a slightly older demographic profile within the county.

What percentage of Ada County's population is under 18?

As of 2024, residents under the age of 18 account for 21.1% of the total population in Ada County, totaling approximately 112,900 residents.

Is the population of seniors growing in Ada County?

Yes, as of 2024, approximately 92,600 residents (17.3%) are aged 65 or older. This segment represents a significant and stable portion of the county's demographic composition.

Related Idaho questions

  • What is the current population of Ada County?
  • What are the fastest-growing cities in Ada County?
  • How does the median household income in Ada County compare to the rest of Idaho?

Sources and verification