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 (2018)
| Rank | Field Office | Number of Beneficiaries |
|---|---|---|
| 1 | Billings | 55,740 |
| 2 | Missoula | 48,190 |
| 3 | Kalispell | 32,600 |
| 4 | Great Falls | 26,210 |
| 5 | Bozeman | 21,770 |
| 6 | Helena | 19,750 |
| 7 | Butte | 18,620 |
| 8 | Glasgow | 6,065 |
| 9 | Havre | 4,635 |
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