The Old-Age, Survivors, and Disability Insurance (OASDI) is a program of the Social Security Administration funded primarily through payroll taxes. It was signed into law in 1935 by then-President Franklin D. Roosevelt.
The OASDI program aims to supplement a worker's lost wages due to retirement, disability or death of a spouse.
The following table shows Social Security field offices ranked by number of retired workers in Montana.
Field Offices Ranking by Number of Retired Workers in Montana (2018)
| Rank | Field Office | Number of Retired Workers |
|---|---|---|
| 1 | Billings | 40,715 |
| 2 | Missoula | 35,335 |
| 3 | Kalispell | 24,045 |
| 4 | Great Falls | 18,695 |
| 5 | Bozeman | 16,905 |
| 6 | Helena | 14,750 |
| 7 | Butte | 13,710 |
| 8 | Glasgow | 4,365 |
| 9 | Havre | 3,110 |
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