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   2018  +1 +5

1,061,818 people lived in Montana on July 1, 2018: the 43rd-largest population among the 50 states and the District of Columbia. The median age was 39.9 years (United States: 38.2); more residents are 65 or older (18.7%) than under 15 (18.0%): an ageing, top-heavy pyramid. There were 101.3 men for every 100 women. Since 2010 the population has grown by 7.2%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2020 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, 2018
Population
1,061,818
Rank by population
43rd of 51
Median age
39.9
Men per 100 women
101.3
Under 15
18.0%
15–64
63.3%
65 and over
18.7%
Child dependency
28.4
Old-age dependency
29.5
Change since 2010
+7.2%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2018
AgeMenWomenTotalShare
0-431,83430,35562,1895.9%
5-932,67430,92163,5956.0%
10-1433,57831,74765,3256.2%
15-1933,17330,69163,8646.0%
20-2438,20634,22672,4326.8%
25-2937,02034,52371,5436.7%
30-3433,72632,49466,2206.2%
35-3934,77632,74967,5256.4%
40-4430,15029,07459,2245.6%
45-4929,82329,10458,9275.5%
50-5430,53930,78461,3235.8%
55-5936,50938,12174,6307.0%
60-6437,24639,59576,8417.2%
65-6934,13334,46268,5956.5%
70-7425,42025,24950,6694.8%
75-7916,79017,55234,3423.2%
80-8410,05111,76721,8182.1%
85+8,74914,00722,7562.1%
How Montana compares with similar-sized states, 2018
RankStateResidentsRelative
40 Hawaii 1,423,102
41 New Hampshire 1,355,064
42 Maine 1,340,123
43 Montana 1,061,818
44 Rhode Island 1,059,338
45 Delaware 966,985
46 South Dakota 879,386
Frequently asked questions about Montana's population
What is the population of Montana?
Montana had an estimated 1,061,818 residents on July 1, 2018, 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 39.9 years in 2018, the 11th oldest of the 51 states and DC. That is 1.7 years older than the national median of 38.2.
How many people in Montana are 65 or older?
About 198,180 residents of Montana (18.7%) were 65 or older in 2018, against 18.0% under 15 and 63.3% aged 15 to 64.
What does the population pyramid of Montana show?
In 2018, Montana: more residents are 65 or older (18.7%) than under 15 (18.0%): an ageing, top-heavy pyramid. There were 101.3 men for every 100 women.
How fast is the population of Montana changing?
The population of Montana grew by 7.2% between 2010 and 2018, and by 0.8% in the last year.
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