Custer County, Montana Age & Gender Statistics (2024)

Total Population

11,961

Median Age

42.7

Male Median

42.4

Female Median

44.2

Custer County, Montana Population Growth

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

Custer County, Montana Demographic Trend

Since 2010, the population of has changed by +3.6%%.

+3.6%% Growth

Custer County, Montana Age & Gender Pyramid

Population pyramid for

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


Custer County, Montana Historical Population Data

YearMedian AgePopulation
202442.711,961
202342.611,938
202242.811,957
202143.011,968
202042.511,563
201941.411,729
201840.711,845
201741.011,895
201640.711,980
201541.211,945
201441.211,869
201341.411,785
201241.711,706
201142.311,621
201041.811,548

Custer County, Montana Age Group Breakdown (2024)

Age CohortPercentage
Under 54.8%
5–1715.0%
18–247.7%
25–3411.5%
35–5426.0%
55–6414.2%
65+20.8%

Dependency Ratios for Custer County, Montana

Total Dependency Ratio:
68.2
Youth Dependency:
33.3
Old-Age Dependency:
34.9

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



Age & Gender FAQs for Custer County, Montana

The median age in Custer County, Montana is 42.7 years.

According to latest Census data, the total population of Custer County, Montana is 11,961.

In Custer County, Montana, seniors (ages 65+) make up 20.8% of the population, while children under 18 represent 15.0%.

Based on historical data since 2010, the population in Custer County, Montana has remained stable.
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