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 South Dakota.
Field Offices Ranking by Number of Beneficiaries in South Dakota (2019)
| Rank | Field Office | Number of Beneficiaries |
|---|---|---|
| 1 | Sioux Falls | 52,750 |
| 2 | Rapid City | 51,660 |
| 3 | Huron | 29,675 |
| 4 | Aberdeen | 20,335 |
| 5 | Watertown | 13,100 |
| 6 | Yankton | 11,205 |
| 7 | Sioux City, IA | 3,625 |
| 8 | Fergus Falls, MN | 85 |
| 9 | Marshall, MN | 50 |
| 10 | Fargo, ND | 35 |
| 11 | North Platte, NE | 30 |
| 11 | Bismarck, ND | 30 |
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