Yellowstone County, MT Population and Components of Change
| Date |
Population |
% Change |
Components of Change |
Total Population Change |
Births |
Deaths |
Inter- national Immigra- tion |
Net Domestic Migration |
| 1970 | 87,367 | - | - |
- | - | - | - |
| 1971 | 90,300 | 3.4 | 2,933 |
- | - | - | - |
| 1972 | 91,900 | 1.8 | 1,600 |
- | - | - | - |
| 1973 | 93,600 | 1.8 | 1,700 |
- | - | - | - |
| 1974 | 96,600 | 3.2 | 3,000 |
- | - | - | - |
| 1975 | 98,900 | 2.4 | 2,300 |
- | - | - | - |
| 1976 | 101,400 | 2.5 | 2,500 |
- | - | - | - |
| 1977 | 103,700 | 2.3 | 2,300 |
- | - | - | - |
| 1978 | 106,900 | 3.1 | 3,200 |
- | - | - | - |
| 1979 | 108,000 | 1.0 | 1,100 |
- | - | - | - |
| 1980 | 108,035 | 0.0 | 35 |
- | - | - | - |
| 1981 | 110,377 | 2.2 | 2,342 |
2,432 | 951 | - | - |
| 1982 | 113,071 | 2.4 | 2,694 |
1,941 | 770 | - | - |
| 1983 | 116,009 | 2.6 | 2,938 |
1,948 | 733 | - | - |
| 1984 | 118,497 | 2.1 | 2,488 |
1,961 | 742 | - | - |
| 1985 | 119,310 | 0.7 | 813 |
1,956 | 803 | - | - |
| 1986 | 118,576 | -0.6 | -734 |
1,891 | 814 | - | - |
| 1987 | 116,422 | -1.8 | -2,154 |
1,789 | 775 | - | - |
| 1988 | 114,415 | -1.7 | -2,007 |
1,675 | 802 | - | - |
| 1989 | 113,700 | -0.6 | -715 |
1,636 | 850 | - | - |
| 1990 | 113,419 | -0.2 | -281 |
1,229 | 639 | - | - |
| 1991 | 115,387 | 1.7 | 1,968 |
2,115 | 1,123 | 36 | 797 |
| 1992 | 118,359 | 2.6 | 2,972 |
1,740 | 928 | 29 | 2,027 |
| 1993 | 121,194 | 2.4 | 2,835 |
1,643 | 934 | 19 | 1,985 |
| 1994 | 123,377 | 1.8 | 2,183 |
1,683 | 968 | 34 | 1,329 |
| 1995 | 125,373 | 1.6 | 1,996 |
1,645 | 1,002 | 45 | 1,162 |
| 1996 | 126,623 | 1.0 | 1,250 |
1,641 | 1,098 | 41 | 561 |
| 1997 | 127,217 | 0.5 | 594 |
1,752 | 1,038 | 38 | -329 |
| 1998 | 127,641 | 0.3 | 424 |
1,663 | 1,056 | 28 | -334 |
| 1999 | 128,736 | 0.9 | 1,095 |
1,739 | 1,059 | 23 | 359 |
| 2000 | 129,352 | 0.5 | 616 |
- | - | - | - |
| 2001 | 130,601 | 1.0 | 1,249 |
2,193 | 1,410 | 33 | 566 |
| 2002 | 131,750 | 0.9 | 1,149 |
1,715 | 1,177 | 23 | 708 |
| 2003 | 133,028 | 1.0 | 1,278 |
1,782 | 1,196 | 13 | 819 |
| 2004 | 134,527 | 1.1 | 1,499 |
1,836 | 1,156 | 30 | 899 |
| 2005 | 136,447 | 1.4 | 1,920 |
1,897 | 1,218 | 24 | 1,335 |
| 2006 | 137,971 | 1.1 | 1,524 |
1,907 | 1,207 | 27 | 868 |
| 2007 | 139,766 | 1.3 | 1,795 |
1,999 | 1,195 | 22 | 976 |
| 2008 | 142,348 | 1.8 | 2,582 |
1,983 | 1,197 | 25 | 1,750 |
Note: Decade years represent April 1, Census data, not the mid-year estimates.
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