Gem County, Idaho Age & Gender Statistics (2024)

Total Population

20,614

Median Age

44.2

Male Median

42.9

Female Median

45.0

Gem County, Idaho Population Growth

Population trends in
Figure 1: Annual population growth trend for (2010–2024).

Gem County, Idaho Demographic Trend

Since 2010, the population of has changed by +22.9%%.

+22.9%% Growth

Gem County, Idaho Age & Gender Pyramid

Population pyramid for

Figure 2: Population distribution by age and gender for 2024.


Gem County, Idaho Historical Population Data

YearMedian AgePopulation
202444.220,614
202342.819,854
202244.019,250
202144.718,692
202045.017,771
201944.617,331
201845.117,052
201745.216,850
201645.416,853
201544.716,731
201443.816,732
201342.716,722
201242.216,768
201141.816,783
201041.716,778

Gem County, Idaho Age Group Breakdown (2024)

Age CohortPercentage
Under 54.9%
5–1717.0%
18–246.9%
25–3410.8%
35–5422.7%
55–6414.5%
65+23.1%

Dependency Ratios for Gem County, Idaho

Total Dependency Ratio:
81.8
Youth Dependency:
39.9
Old-Age Dependency:
41.9

The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).



Age & Gender FAQs for Gem County, Idaho

The median age in Gem County, Idaho is 44.2 years.

According to latest Census data, the total population of Gem County, Idaho is 20,614.

In Gem County, Idaho, seniors (ages 65+) make up 23.1% of the population, while children under 18 represent 17.0%.

Based on historical data since 2010, the population in Gem County, Idaho is aging.
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