Yellowstone County Historical Age Data
ACS 2010-2014 data
Total population: 151,965
Median Age (
see rank)
Yellowstone County | 38.10 years old |
Montana | 39.80 years old |
U.S. | 37.40 years old |
Median Age, Male (
see rank)
Yellowstone County | 37.10 years old |
Montana | 38.60 years old |
U.S. | 36.10 years old |
Median Age, Female (
see rank)
Yellowstone County | 39.10 years old |
Montana | 40.90 years old |
U.S. | 38.80 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 10,164 | 6.69%, see rank | 6.07% | 6.36% |
5 to 9 years | 10,336 | 6.80%, see rank | 6.39% | 6.51% |
10 to 14 years | 9,627 | 6.34%, see rank | 6.00% | 6.59% |
15 to 19 years | 9,314 | 6.13%, see rank | 6.51% | 6.85% |
20 to 24 years | 9,517 | 6.26%, see rank | 7.07% | 7.13% |
25 to 34 years | 20,896 | 13.75%, see rank | 12.49% | 13.47% |
35 to 44 years | 18,412 | 12.12%, see rank | 11.27% | 12.96% |
45 to 54 years | 21,124 | 13.90%, see rank | 13.90% | 14.09% |
55 to 64 years | 20,232 | 13.31%, see rank | 14.59% | 12.29% |
65 to 74 years | 11,888 | 7.82%, see rank | 8.89% | 7.64% |
75 to 84 | 7,184 | 4.73%, see rank | 4.77% | 4.25% |
85 years and over | 3,271 | 2.15%, see rank | 2.05% | 1.85% |
US Census 2010 data
Total population: 147,972
Median Age (
see rank)
Yellowstone County | 38.30 years old |
Montana | 39.80 years old |
U.S. | 37.20 years old |
Median Age, Male (
see rank)
Yellowstone County | 37.10 years old |
Montana | 38.80 years old |
U.S. | 35.80 years old |
Median Age, Female (
see rank)
Yellowstone County | 39.40 years old |
Montana | 41.00 years old |
U.S. | 38.50 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 10,122 | 6.84%, see rank | 6.31% | 6.54% |
5 to 9 years | 9,694 | 6.55%, see rank | 6.14% | 6.59% |
10 to 14 years | 9,384 | 6.34%, see rank | 6.18% | 6.70% |
15 to 19 years | 9,450 | 6.39%, see rank | 6.74% | 7.14% |
20 to 24 years | 9,639 | 6.51%, see rank | 6.79% | 6.99% |
25 to 34 years | 20,067 | 13.56%, see rank | 12.42% | 13.30% |
35 to 44 years | 17,789 | 12.02%, see rank | 11.42% | 13.30% |
45 to 54 years | 22,223 | 15.02%, see rank | 15.14% | 14.58% |
55 to 64 years | 18,736 | 12.66%, see rank | 14.03% | 11.82% |
65 to 74 years | 10,742 | 7.26%, see rank | 8.16% | 7.03% |
75 to 84 | 6,884 | 4.65%, see rank | 4.65% | 4.23% |
85 years and over | 3,242 | 2.19%, see rank | 2.02% | 1.78% |
ACS 2008-2012 data
Total population: 148,191
Median Age (
see rank)
Yellowstone County | 38.50 years old |
Montana | 39.90 years old |
U.S. | 37.20 years old |
Median Age, Male (
see rank)
Yellowstone County | 37.50 years old |
Montana | 38.80 years old |
U.S. | 35.80 years old |
Median Age, Female (
see rank)
Yellowstone County | 39.50 years old |
Montana | 41.00 years old |
U.S. | 38.50 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 9,947 | 6.71%, see rank | 6.14% | 6.51% |
5 to 9 years | 9,805 | 6.62%, see rank | 6.31% | 6.57% |
10 to 14 years | 9,457 | 6.38%, see rank | 6.12% | 6.68% |
15 to 19 years | 9,458 | 6.38%, see rank | 6.76% | 7.09% |
20 to 24 years | 9,458 | 6.38%, see rank | 6.91% | 7.04% |
25 to 34 years | 19,933 | 13.45%, see rank | 12.28% | 13.32% |
35 to 44 years | 18,277 | 12.33%, see rank | 11.53% | 13.34% |
45 to 54 years | 21,895 | 14.77%, see rank | 14.91% | 14.44% |
55 to 64 years | 19,037 | 12.85%, see rank | 14.10% | 11.84% |
65 to 74 years | 10,829 | 7.31%, see rank | 8.22% | 7.12% |
75 to 84 | 7,051 | 4.76%, see rank | 4.74% | 4.25% |
85 years and over | 3,044 | 2.05%, see rank | 1.97% | 1.78% |
ACS 2006-2010 data
Total population: 144,050
Median Age (
see rank)
Yellowstone County | 38.30 years old |
Montana | 39.70 years old |
U.S. | 36.90 years old |
Median Age, Male (
see rank)
Yellowstone County | 37.30 years old |
Montana | 38.60 years old |
U.S. | 35.60 years old |
Median Age, Female (
see rank)
Yellowstone County | 39.30 years old |
Montana | 40.90 years old |
U.S. | 38.10 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 9,685 | 6.72%, see rank | 6.13% | 6.62% |
5 to 9 years | 9,604 | 6.67%, see rank | 6.20% | 6.62% |
10 to 14 years | 9,113 | 6.33%, see rank | 6.33% | 6.79% |
15 to 19 years | 9,491 | 6.59%, see rank | 7.14% | 7.28% |
20 to 24 years | 9,407 | 6.53%, see rank | 7.02% | 6.98% |
25 to 34 years | 19,024 | 13.21%, see rank | 11.87% | 13.22% |
35 to 44 years | 18,433 | 12.80%, see rank | 12.02% | 13.89% |
45 to 54 years | 21,990 | 15.27%, see rank | 15.65% | 14.57% |
55 to 64 years | 17,292 | 12.00%, see rank | 13.27% | 11.28% |
65 to 74 years | 10,093 | 7.01%, see rank | 7.69% | 6.74% |
75 to 84 | 7,244 | 5.03%, see rank | 4.86% | 4.30% |
85 years and over | 2,674 | 1.86%, see rank | 1.82% | 1.70% |
ACS 2005-2009 data
Total population: 140,436
Median Age (
see rank)
Yellowstone County | 37.70 years old |
Montana | 39.00 years old |
U.S. | 36.50 years old |
Median Age, Male (
see rank)
Yellowstone County | 36.20 years old |
Montana | 37.70 years old |
U.S. | 35.20 years old |
Median Age, Female (
see rank)
Yellowstone County | 38.80 years old |
Montana | 40.20 years old |
U.S. | 37.90 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 9,632 | 6.86%, see rank | 6.21% | 6.92% |
5 to 9 years | 9,299 | 6.62%, see rank | 6.08% | 6.59% |
10 to 14 years | 8,988 | 6.40%, see rank | 6.35% | 6.83% |
15 to 19 years | 9,307 | 6.63%, see rank | 7.34% | 7.15% |
20 to 24 years | 9,100 | 6.48%, see rank | 7.81% | 7.02% |
25 to 34 years | 19,512 | 13.89%, see rank | 11.76% | 13.42% |
35 to 44 years | 18,287 | 13.02%, see rank | 12.26% | 14.18% |
45 to 54 years | 21,243 | 15.13%, see rank | 15.63% | 14.48% |
55 to 64 years | 15,793 | 11.25%, see rank | 12.47% | 10.81% |
65 to 74 years | 9,432 | 6.72%, see rank | 7.28% | 6.50% |
75 to 84 | 7,373 | 5.25%, see rank | 4.90% | 4.40% |
85 years and over | 2,470 | 1.76%, see rank | 1.91% | 1.71% |
US Census 2000 data
Total population: 129,352
Median Age (
see rank)
Yellowstone County | 36.90 years old |
Montana | 37.50 years old |
U.S. | 35.30 years old |
Median Age, Male (
see rank)
Yellowstone County | 35.70 years old |
Montana | 36.60 years old |
U.S. | 34.00 years old |
Median Age, Female (
see rank)
Yellowstone County | 37.90 years old |
Montana | 38.50 years old |
U.S. | 36.50 years old |
| Yellowstone County | % of the Total Population | Montana | U.S. |
Under 5 years | 8,539 | 6.60%, see rank | 6.08% | 6.81% |
5 to 9 years | 9,097 | 7.03%, see rank | 6.87% | 7.30% |
10 to 14 years | 9,538 | 7.37%, see rank | 7.68% | 7.29% |
15 to 19 years | 9,408 | 7.27%, see rank | 7.90% | 7.18% |
20 to 24 years | 8,366 | 6.47%, see rank | 6.47% | 6.74% |
25 to 34 years | 16,242 | 12.56%, see rank | 11.45% | 14.18% |
35 to 44 years | 20,900 | 16.16%, see rank | 15.73% | 16.04% |
45 to 54 years | 18,615 | 14.39%, see rank | 14.97% | 13.39% |
55 to 64 years | 11,404 | 8.82%, see rank | 9.43% | 8.63% |
65 to 74 years | 8,780 | 6.79%, see rank | 6.93% | 6.54% |
75 to 84 | 6,222 | 4.81%, see rank | 4.78% | 4.39% |
85 years and over | 2,241 | 1.73%, see rank | 1.70% | 1.51% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.