| Montana |  |
AGE DISTRIBUTION
Drawn as a "population pyramid," an area's age-sex structure hints at its patterns of growth. A top heavy pyramid, like the one for Grant County, North Dakota , suggests negative population growth that might be due to any number of factors, including high death rates, low birth rates, and increased emigration from the area. A bottom heavy pyramid, like the one drawn for Orange County, Florida , suggests high birthrates, falling or stable death rates, and the potential for rapid population growth. Most areas, however, fall somewhere between these two extremes and have a population pyramid that resembles a square, indicating slow and sustained growth with the birth rate exceeding the death rate, though not by a great margin.
| Age Distribution by Sex, 2000 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 449,480 | 49.8% | 452,715 | 50.2% |
| 0-4 | 28,212 | 3.1% | 26,657 | 3.0% |
| 5-9 | 31,822 | 3.5% | 30,141 | 3.3% |
| 10-14 | 35,657 | 4.0% | 33,641 | 3.7% |
| 15-19 | 36,789 | 4.1% | 34,521 | 3.8% |
| 20-24 | 30,345 | 3.4% | 28,034 | 3.1% |
| 25-29 | 26,389 | 2.9% | 24,715 | 2.7% |
| 30-34 | 26,060 | 2.9% | 26,115 | 2.9% |
| 35-39 | 32,877 | 3.6% | 33,703 | 3.7% |
| 40-44 | 37,065 | 4.1% | 38,296 | 4.2% |
| 45-49 | 36,907 | 4.1% | 36,491 | 4.0% |
| 50-54 | 31,615 | 3.5% | 30,075 | 3.3% |
| 55-59 | 23,864 | 2.6% | 23,310 | 2.6% |
| 60-64 | 18,936 | 2.1% | 19,009 | 2.1% |
| 65-69 | 15,810 | 1.8% | 16,731 | 1.9% |
| 70-74 | 14,045 | 1.6% | 15,933 | 1.8% |
| 75-79 | 10,941 | 1.2% | 13,762 | 1.5% |
| 80-84 | 7,264 | 0.8% | 11,126 | 1.2% |
| 85 | 4,882 | 0.5% | 10,455 | 1.2% |
| Age Distribution by Sex, 1990 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 395,769 | 49.5% | 403,296 | 50.5% |
| 0-4 | 30,409 | 3.8% | 28,848 | 3.6% |
| 5-9 | 33,493 | 4.2% | 31,884 | 4.0% |
| 10-14 | 32,363 | 4.1% | 30,536 | 3.8% |
| 15-19 | 29,473 | 3.7% | 27,340 | 3.4% |
| 20-24 | 24,249 | 3.0% | 23,520 | 2.9% |
| 25-29 | 27,742 | 3.5% | 28,369 | 3.6% |
| 30-34 | 32,773 | 4.1% | 34,186 | 4.3% |
| 35-39 | 34,185 | 4.3% | 33,987 | 4.3% |
| 40-44 | 30,034 | 3.8% | 28,550 | 3.6% |
| 45-49 | 22,947 | 2.9% | 22,186 | 2.8% |
| 50-54 | 18,561 | 2.3% | 18,612 | 2.3% |
| 55-59 | 16,756 | 2.1% | 17,249 | 2.2% |
| 60-64 | 16,730 | 2.1% | 17,586 | 2.2% |
| 65-69 | 15,571 | 1.9% | 16,925 | 2.1% |
| 70-74 | 12,882 | 1.6% | 15,506 | 1.9% |
| 75-79 | 9,111 | 1.1% | 12,297 | 1.5% |
| 80-84 | 5,275 | 0.7% | 8,254 | 1.0% |
| 85 | 3,215 | 0.4% | 7,461 | 0.9% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).