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   2011  +1 +5

997,518 people lived in Montana on July 1, 2011: the 44th-largest population among the 50 states and the District of Columbia. The median age was 39.9 years (United States: 37.3); children under 15 (18.5%) clearly outnumber residents 65 and older (15.1%): a relatively young population. There were 100.7 men for every 100 women. Since 2010 the population has grown by 0.7%. 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, 2011
Population
997,518
Rank by population
44th of 51
Median age
39.9
Men per 100 women
100.7
Under 15
18.5%
15–64
66.4%
65 and over
15.1%
Child dependency
27.9
Old-age dependency
22.7
Change since 2010
+0.7%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2011
AgeMenWomenTotalShare
0-431,67030,39662,0666.2%
5-931,33630,02861,3646.2%
10-1431,57929,80461,3836.2%
15-1934,45931,70366,1626.6%
20-2435,79833,36169,1596.9%
25-2932,92631,02963,9556.4%
30-3431,41229,72261,1346.1%
35-3927,94926,62154,5705.5%
40-4429,13128,70057,8315.8%
45-4933,18533,43866,6236.7%
50-5438,16339,58577,7487.8%
55-5938,12139,02077,1417.7%
60-6434,54833,31867,8666.8%
65-6924,19123,64447,8354.8%
70-7417,59318,15735,7503.6%
75-7912,28013,74826,0282.6%
80-848,84611,59420,4402.0%
85+7,32213,14120,4632.1%
How Montana compares with similar-sized states, 2011
RankStateResidentsRelative
41 Maine 1,328,473
42 New Hampshire 1,320,444
43 Rhode Island 1,053,829
44 Montana 997,518
45 Delaware 907,590
46 South Dakota 823,740
47 Alaska 722,349
Frequently asked questions about Montana's population
What is the population of Montana?
Montana had an estimated 997,518 residents on July 1, 2011, 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 39.9 years in 2011, the 8th oldest of the 51 states and DC. That is 2.6 years older than the national median of 37.3.
How many people in Montana are 65 or older?
About 150,516 residents of Montana (15.1%) were 65 or older in 2011, against 18.5% under 15 and 66.4% aged 15 to 64.
What does the population pyramid of Montana show?
In 2011, Montana: children under 15 (18.5%) clearly outnumber residents 65 and older (15.1%): a relatively young population. There were 100.7 men for every 100 women.
How fast is the population of Montana changing?
The population of Montana grew by 0.7% between 2010 and 2011, and by 0.7% in the last year.
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