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 Iowa.
Field Offices Ranking by Number of Beneficiaries in Iowa (2018)
| Rank | Field Office | Number of Beneficiaries |
|---|---|---|
| 1 | Des Moines | 103,360 |
| 2 | Waterloo | 71,770 |
| 3 | Davenport | 58,445 |
| 4 | Cedar Rapids | 57,235 |
| 5 | Sioux City | 40,530 |
| 6 | Ottumwa | 40,480 |
| 7 | Dubuque | 35,330 |
| 8 | Council Bluffs | 28,600 |
| 9 | Ames | 28,140 |
| 10 | Mason City | 27,440 |
| 11 | Creston | 26,855 |
| 12 | Fort Dodge | 25,990 |
| 13 | Burlington | 25,600 |
| 14 | Coralville | 24,950 |
| 15 | Spencer | 22,570 |
| 16 | Carroll | 20,925 |
| 17 | Marshalltown | 8,985 |
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