Share of the population by age and sex, five-year groups

Population of Montana, 2010–2025 · click to pick a year
Estimates up to 2019 are built on the 2010 Census, those from 2020 on the 2020 Census. A line that steps up or down between 2019 and 2020 reflects this re-basing, not a sudden change in population.

Year

-5 -1   2021  +1 +5

1,106,416 people lived in Montana on July 1, 2021: the 43rd-largest population among the 50 states and the District of Columbia. The median age was 40.5 years (United States: 38.9); more residents are 65 or older (20.3%) than under 15 (17.6%): an ageing, top-heavy pyramid. There were 100.8 men for every 100 women. Since 2010 the population has grown by 11.7%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2025 estimates (resident population on July 1; public domain). Median age, shares, dependency ratios and rankings are calculated by PopulationPyramid.net from these estimates; the Census Bureau does not endorse this site.

Key indicators, 2021
Population
1,106,416
Rank by population
43rd of 51
Median age
40.5
Men per 100 women
100.8
Under 15
17.6%
15–64
62.1%
65 and over
20.3%
Child dependency
28.4
Old-age dependency
32.8
Change since 2010
+11.7%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2021
AgeMenWomenTotalShare
0-429,88628,59658,4825.3%
5-934,20032,45866,6586.0%
10-1435,63033,95569,5856.3%
15-1935,37532,98468,3596.2%
20-2436,86234,55271,4146.5%
25-2934,40732,59767,0046.1%
30-3437,02035,23672,2566.5%
35-3936,70235,59072,2926.5%
40-4434,05432,77666,8306.0%
45-4929,77428,38058,1545.3%
50-5430,77530,52261,2975.5%
55-5934,06335,31969,3826.3%
60-6438,74941,02179,7707.2%
65-6937,14138,90476,0456.9%
70-7431,17831,35562,5335.7%
75-7919,21019,92239,1323.5%
80-8411,52013,24724,7672.2%
85+8,84013,61622,4562.0%
How Montana compares with similar-sized states, 2021
RankStateResidentsRelative
40 Hawaii 1,446,909
41 New Hampshire 1,387,907
42 Maine 1,379,009
43 Montana 1,106,416
44 Rhode Island 1,097,381
45 Delaware 1,005,130
46 South Dakota 896,303
Frequently asked questions about Montana's population
What is the population of Montana?
Montana had an estimated 1,106,416 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 43rd among the 51 states and the District of Columbia.
What is the median age in Montana?
The median age in Montana was 40.5 years in 2021, the 12th oldest of the 51 states and DC. That is 1.6 years older than the national median of 38.9.
How many people in Montana are 65 or older?
About 224,933 residents of Montana (20.3%) were 65 or older in 2021, against 17.6% under 15 and 62.1% aged 15 to 64.
What does the population pyramid of Montana show?
In 2021, Montana: more residents are 65 or older (20.3%) than under 15 (17.6%): an ageing, top-heavy pyramid. There were 100.8 men for every 100 women.
How fast is the population of Montana changing?
The population of Montana grew by 11.7% between 2010 and 2021, and by 1.8% in the last year.
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