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 South Dakota.
Field Offices Ranking by Number of Retired Workers in South Dakota (2018)
| Rank | Field Office | Number of Retired Workers |
|---|---|---|
| 1 | Sioux Falls | 38,465 |
| 2 | Rapid City | 37,045 |
| 3 | Huron | 21,665 |
| 4 | Aberdeen | 14,965 |
| 5 | Watertown | 9,605 |
| 6 | Yankton | 8,190 |
| 7 | Sioux City, IA | 2,825 |
| 8 | Fergus Falls, MN | 55 |
| 9 | Marshall, MN | 45 |
| 10 | North Platte, NE | 30 |
| 11 | Fargo, ND | 25 |
| 12 | Bismarck, ND | 20 |
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