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 cities ranked by number of beneficiaries in Montana.
Field Offices Ranking by Number of Beneficiaries in Montana (2019)
| Rank | Field Office | Number of Beneficiaries |
|---|---|---|
| 1 | Billings | 57,035 |
| 2 | Missoula | 49,475 |
| 3 | Kalispell | 33,680 |
| 4 | Great Falls | 26,530 |
| 5 | Bozeman | 22,480 |
| 6 | Helena | 20,230 |
| 7 | Butte | 18,965 |
| 8 | Glasgow | 6,110 |
| 9 | Havre | 4,690 |
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