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 (2019)
| Rank | Field Office | Number of Beneficiaries |
|---|---|---|
| 1 | Des Moines | 105,955 |
| 2 | Waterloo | 72,405 |
| 3 | Davenport | 59,365 |
| 4 | Cedar Rapids | 58,150 |
| 5 | Sioux City | 40,950 |
| 6 | Ottumwa | 40,825 |
| 7 | Dubuque | 35,840 |
| 8 | Ames | 29,100 |
| 9 | Council Bluffs | 28,955 |
| 10 | Mason City | 27,685 |
| 11 | Creston | 27,090 |
| 12 | Fort Dodge | 25,975 |
| 13 | Burlington | 25,765 |
| 14 | Coralville | 25,755 |
| 15 | Spencer | 22,730 |
| 16 | Carroll | 21,160 |
| 17 | Marshalltown | 9,025 |
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