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   2010  +1 +5

990,730 people lived in Montana on July 1, 2010: the 44th-largest population among the 50 states and the District of Columbia. The median age was 39.8 years (United States: 37.2); children under 15 (18.6%) clearly outnumber residents 65 and older (14.9%): a relatively young population. There were 100.8 men for every 100 women. 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, 2010
Population
990,730
Rank by population
44th of 51
Median age
39.8
Men per 100 women
100.8
Under 15
18.6%
15–64
66.5%
65 and over
14.9%
Child dependency
28.0
Old-age dependency
22.4
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2010
AgeMenWomenTotalShare
0-432,07030,36262,4326.3%
5-930,97929,82360,8026.1%
10-1431,58229,53461,1166.2%
15-1934,60232,10066,7026.7%
20-2435,02732,41767,4446.8%
25-2933,13331,03764,1706.5%
30-3430,41428,73359,1476.0%
35-3928,27527,09355,3685.6%
40-4428,84328,51457,3575.8%
45-4934,86135,37070,2317.1%
50-5438,57639,98578,5617.9%
55-5937,92838,28576,2137.7%
60-6432,52931,21463,7436.4%
65-6923,59323,21946,8124.7%
70-7416,93617,53334,4693.5%
75-7912,04113,63325,6742.6%
80-848,78911,58020,3692.1%
85+7,08013,04020,1202.0%
How Montana compares with similar-sized states, 2010
RankStateResidentsRelative
41 Maine 1,327,651
42 New Hampshire 1,316,807
43 Rhode Island 1,053,994
44 Montana 990,730
45 Delaware 899,647
46 South Dakota 816,193
47 Alaska 713,982
Frequently asked questions about Montana's population
What is the population of Montana?
Montana had an estimated 990,730 residents on July 1, 2010, according to the U.S. Census Bureau, Population Estimates Program. That ranks 44th among the 51 states and the District of Columbia.
What is the median age in Montana?
The median age in Montana was 39.8 years in 2010, the 8th oldest of the 51 states and DC. That is 2.6 years older than the national median of 37.2.
How many people in Montana are 65 or older?
About 147,444 residents of Montana (14.9%) were 65 or older in 2010, against 18.6% under 15 and 66.5% aged 15 to 64.
What does the population pyramid of Montana show?
In 2010, Montana: children under 15 (18.6%) clearly outnumber residents 65 and older (14.9%): a relatively young population. There were 100.8 men for every 100 women.
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