Summary: Summary of age-related census data for 1990 and 2000
| Amount | ||||||
| 2000 | 1990 | |||||
| Montana | National | % National | Montana | National | % National | |
| Households | ||||||
| All | 358,667 | 105,480,101 | 0.3% | 306,163 | 91,947,410 | 0.3% |
| Age 65+ | 83,982 | 24,672,708 | 0.3% | 74,004 | 22,154,422 | 0.3% |
| Alone | 35,991 | 9,722,857 | 0.4% | 32,208 | 8,824,845 | 0.4% |
| Not Alone | 47,991 | 14,949,851 | 0.3% | 41,796 | 13,329,577 | 0.3% |
| Population | ||||||
| All Ages | 902,195 | 281,421,906 | 0.3% | 799,065 | 248,709,873 | 0.3% |
| Under 5 years | 54,869 | 19,175,798 | 0.3% | 59,257 | 18,354,443 | 0.3% |
| 5 to 9 years | 61,963 | 20,549,505 | 0.3% | 65,377 | 18,099,179 | 0.4% |
| 10 to 14 years | 69,298 | 20,528,072 | 0.3% | 62,899 | 17,114,249 | 0.4% |
| 15 to 19 years | 71,310 | 20,219,890 | 0.4% | 56,813 | 17,754,015 | 0.3% |
| 20 to 24 years | 58,379 | 18,964,001 | 0.3% | 47,769 | 19,020,312 | 0.3% |
| 25 to 34 years | 103,279 | 39,891,724 | 0.3% | 123,070 | 43,175,932 | 0.3% |
| 35 to 44 years | 141,941 | 45,148,527 | 0.3% | 126,756 | 37,578,903 | 0.3% |
| 45 to 54 years | 135,088 | 37,677,952 | 0.4% | 82,306 | 25,223,086 | 0.3% |
| 55 to 59 years | 47,174 | 13,469,237 | 0.4% | 34,005 | 10,531,756 | 0.3% |
| 60 to 64 years | 37,945 | 10,805,447 | 0.4% | 34,316 | 10,616,167 | 0.3% |
| 65 to 74 years | 62,519 | 18,390,986 | 0.3% | 60,884 | 18,106,558 | 0.3% |
| 75 to 84 years | 43,093 | 12,361,180 | 0.3% | 34,937 | 10,055,108 | 0.3% |
| 85 years and over | 15,337 | 4,239,587 | 0.4% | 10,676 | 3,080,165 | 0.3% |
| Under Age 15 | 186,130 | 60,253,375 | 0.3% | 187,533 | 53,567,871 | 0.4% |
| Age 15-24 | 129,689 | 39,183,891 | 0.3% | 104,582 | 36,774,327 | 0.3% |
| Age 25-34 | 103,279 | 39,891,724 | 0.3% | 123,070 | 43,175,932 | 0.3% |
| Age 35-44 | 141,941 | 45,148,527 | 0.3% | 126,756 | 37,578,903 | 0.3% |
| Age 45-54 | 135,088 | 37,677,952 | 0.4% | 82,306 | 25,223,086 | 0.3% |
| Age 55-64 | 85,119 | 24,274,684 | 0.4% | 68,321 | 21,147,923 | 0.3% |
| Age 65-74 | 62,519 | 18,390,986 | 0.3% | 60,884 | 18,106,558 | 0.3% |
| Age 75-84 | 43,093 | 12,361,180 | 0.3% | 34,937 | 10,055,108 | 0.3% |
| Age 85+ | 15,337 | 4,239,587 | 0.4% | 10,676 | 3,080,165 | 0.3% |
| Under Age 55 | 696,127 | 222,155,469 | 0.3% | 624,247 | 196,320,119 | 0.3% |
| Age 55+ | 206,068 | 59,266,437 | 0.3% | 174,818 | 52,389,754 | 0.3% |
| Age 65+ | 120,949 | 34,991,753 | 0.3% | 106,497 | 31,241,831 | 0.3% |
| Age 75+ | 58,430 | 16,600,767 | 0.4% | 45,613 | 13,135,273 | 0.3% |
| Age 85+ | 15,337 | 4,239,587 | 0.4% | 10,676 | 3,080,165 | 0.3% |
| Age 65+ population living alone | 30% | 28% | 30% | 28% | ||
| 1990-2000 Change | ||||||
| Amount of Change | Percentage Change | |||||
| Montana | National | % National | Montana | National | Difference | |
| Households | ||||||
| All | 52,504 | 13,532,691 | 0.4% | 17% | 15% | 2% |
| Age 65+ | 9,978 | 2,518,286 | 0.4% | 13% | 11% | 2% |
| Alone | 3,783 | 898,012 | 0.4% | 12% | 10% | 2% |
| Not Alone | 6,195 | 1,620,274 | 0.4% | 15% | 12% | 3% |
| Population | ||||||
| All Ages | 103,130 | 32,712,033 | 0.3% | 13% | 13% | - |
| Under 5 years | (4,388) | 821,355 | (0.5%) | (7%) | 4% | (11%) |
| 5 to 9 years | (3,414) | 2,450,326 | (0.1%) | (5%) | 14% | (19%) |
| 10 to 14 years | 6,399 | 3,413,823 | 0.2% | 10% | 20% | (10%) |
| 15 to 19 years | 14,497 | 2,465,875 | 0.6% | 26% | 14% | 12% |
| 20 to 24 years | 10,610 | (56,311) | 18.8% | 22% | - | 22% |
| 25 to 34 years | (19,791) | (3,284,208) | (0.6%) | (16%) | (8%) | (8%) |
| 35 to 44 years | 15,185 | 7,569,624 | 0.2% | 12% | 20% | (8%) |
| 45 to 54 years | 52,782 | 12,454,866 | 0.4% | 64% | 49% | 15% |
| 55 to 59 years | 13,169 | 2,937,481 | 0.4% | 39% | 28% | 11% |
| 60 to 64 years | 3,629 | 189,280 | 1.9% | 11% | 2% | 9% |
| 65 to 74 years | 1,635 | 284,428 | 0.6% | 3% | 2% | 1% |
| 75 to 84 years | 8,156 | 2,306,072 | 0.4% | 23% | 23% | - |
| 85 years and over | 4,661 | 1,159,422 | 0.4% | 44% | 38% | 6% |
| Under Age 15 | (1,403) | 6,685,504 | - | (1%) | 12% | (13%) |
| Age 15-24 | 25,107 | 2,409,564 | 1.0% | 24% | 7% | 17% |
| Age 25-34 | (19,791) | (3,284,208) | (0.6%) | (16%) | (8%) | (8%) |
| Age 35-44 | 15,185 | 7,569,624 | 0.2% | 12% | 20% | (8%) |
| Age 45-54 | 52,782 | 12,454,866 | 0.4% | 64% | 49% | 15% |
| Age 55-64 | 16,798 | 3,126,761 | 0.5% | 25% | 15% | 10% |
| Age 65-74 | 1,635 | 284,428 | 0.6% | 3% | 2% | 1% |
| Age 75-84 | 8,156 | 2,306,072 | 0.4% | 23% | 23% | - |
| Age 85+ | 4,661 | 1,159,422 | 0.4% | 44% | 38% | 6% |
| Under Age 55 | 71,880 | 25,835,350 | 0.3% | 12% | 13% | (1%) |
| Age 55+ | 31,250 | 6,876,683 | 0.5% | 18% | 13% | 5% |
| Age 65+ | 14,452 | 3,749,922 | 0.4% | 14% | 12% | 2% |
| Age 75+ | 12,817 | 3,465,494 | 0.4% | 28% | 26% | 2% |
| Age 85+ | 4,661 | 1,159,422 | 0.4% | 44% | 38% | 6% |
| Percent of Total | ||||||
| 2000 | 1990 | |||||
| Montana | National | Difference | Montana | National | Difference | |
| Households | ||||||
| Age 65+ | 23% | 23% | - | 24% | 24% | - |
| Alone | 10% | 9% | 1% | 11% | 10% | 1% |
| Not Alone | 13% | 14% | (1%) | 14% | 14% | - |
| Population | ||||||
| Under 5 years | 6% | 7% | (1%) | 7% | 7% | - |
| 5 to 9 years | 7% | 7% | - | 8% | 7% | 1% |
| 10 to 14 years | 8% | 7% | 1% | 8% | 7% | 1% |
| 15 to 19 years | 8% | 7% | 1% | 7% | 7% | - |
| 20 to 24 years | 6% | 7% | (1%) | 6% | 8% | (2%) |
| 25 to 34 years | 11% | 14% | (3%) | 15% | 17% | (2%) |
| 35 to 44 years | 16% | 16% | - | 16% | 15% | 1% |
| 45 to 54 years | 15% | 13% | 2% | 10% | 10% | - |
| 55 to 59 years | 5% | 5% | - | 4% | 4% | - |
| 60 to 64 years | 4% | 4% | - | 4% | 4% | - |
| 65 to 74 years | 7% | 7% | - | 8% | 7% | 1% |
| 75 to 84 years | 5% | 4% | 1% | 4% | 4% | - |
| 85 years and over | 2% | 2% | - | 1% | 1% | - |
| Under Age 15 | 21% | 21% | - | 23% | 22% | 1% |
| Age 15-24 | 14% | 14% | - | 13% | 15% | (2%) |
| Age 25-34 | 11% | 14% | (3%) | 15% | 17% | (2%) |
| Age 35-44 | 16% | 16% | - | 16% | 15% | 1% |
| Age 45-54 | 15% | 13% | 2% | 10% | 10% | - |
| Age 55-64 | 9% | 9% | - | 9% | 9% | - |
| Age 65-74 | 7% | 7% | - | 8% | 7% | 1% |
| Age 75-84 | 5% | 4% | 1% | 4% | 4% | - |
| Age 85+ | 2% | 2% | - | 1% | 1% | - |
| Under Age 55 | 77% | 79% | (2%) | 78% | 79% | (1%) |
| Age 55+ | 23% | 21% | 2% | 22% | 21% | 1% |
| Age 65+ | 13% | 12% | 1% | 13% | 13% | - |
| Age 75+ | 6% | 6% | - | 6% | 5% | 1% |
| Age 85+ | 2% | 2% | - | 1% | 1% | - |