Jefferson County, MT population age distributions
A complete breakdown of Jefferson County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 5 years | 543 | 4.42% |
| 5 to 9 years | 714 | 5.82% |
| 10 to 14 years | 707 | 5.76% |
| 15 to 19 years | 741 | 6.04% |
| 20 to 24 years | 580 | 4.73% |
| 25 to 29 years | 555 | 4.52% |
| 30 to 34 years | 548 | 4.47% |
| 35 to 39 years | 574 | 4.68% |
| 40 to 44 years | 816 | 6.65% |
| 45 to 49 years | 807 | 6.58% |
| 50 to 54 years | 821 | 6.69% |
| 55 to 59 years | 1,069 | 8.71% |
| 60 to 64 years | 1,046 | 8.52% |
| 65 to 69 years | 1,206 | 9.83% |
| 70 to 74 years | 682 | 5.56% |
| 75 to 79 years | 483 | 3.94% |
| 80 to 84 years | 248 | 2.02% |
| 85 years and over | 133 | 1.08% |
TABLE OF CONTENTS
Jefferson County, MT population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022
FIGURE 1
Jefferson County, MT population by age group.
The largest age group is 65 to 69 years with a population of 1,206 (9.83% of the total population).
The largest age group in Jefferson County, MT was for the group of age 65 to 69 years with a population of 1,206 (9.83%), according to the 2018-2022 American Community Survey.
At the same time, the smallest age group in Jefferson County, MT was the 85 years and over with a population of 133 (1.08%).
Jefferson County, MT population by age cohort
To better understand the age distribution of Jefferson County, MT's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above
FIGURE 2
Jefferson County, MT population by age cohort
The largest age group was 18 to 64 years with a population of 7,055 (57.48% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Jefferson County 's population under 18 was 20.09%, compared to the 22.11% nationwide.
- Jefferson County's working population (between 18 and 64) was 57.48%, compared to 61.36% nationwide.
- Jefferson County's elderly or the senior population (over 65 age) was 22.42% as compared to 16.53% nationwide.
Jefferson County, MT population pyramid
Population pyramid for Jefferson County, MT is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Jefferson County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Jefferson County, MT, is 26.0.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Jefferson County, MT, is 36.4.
- Total dependency ratio for Jefferson County, MT is 62.4.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Jefferson County, MT is 2.7.
FIGURE 3
Jefferson County, MT population pyramid
Jefferson County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
Jefferson County, MT population pyramid
Here's the Jefferson County, MT's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 314 | 229 | 543 |
| 5 to 9 years | 369 | 345 | 714 |
| 10 to 14 years | 339 | 368 | 707 |
| 15 to 19 years | 421 | 320 | 741 |
| 20 to 24 years | 259 | 321 | 580 |
| 25 to 29 years | 279 | 276 | 555 |
| 30 to 34 years | 284 | 264 | 548 |
| 35 to 39 years | 265 | 309 | 574 |
| 40 to 44 years | 447 | 369 | 816 |
| 45 to 49 years | 405 | 402 | 807 |
| 50 to 54 years | 421 | 400 | 821 |
| 55 to 59 years | 585 | 484 | 1,069 |
| 60 to 64 years | 474 | 572 | 1,046 |
| 65 to 69 years | 596 | 610 | 1,206 |
| 70 to 74 years | 385 | 297 | 682 |
| 75 to 79 years | 260 | 223 | 483 |
| 80 to 84 years | 123 | 125 | 248 |
| 85 years and over | 56 | 77 | 133 |
Things to know
What is the population of Jefferson County, MT under 18?
Jefferson County's population under the age of 18 is 2,466, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 20.09% of the total resident population of Jefferson County, MT.
What is the aging population in Jefferson County, MT?
Jefferson County's population aged 65 years and above was 2,752. As per the U.S. Census Bureau's American Community Survey, this population is 22.42% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates