Where can I find my social security number? March 15, 2022 16:13 Updated You can find the social security number on the customer card of your health insurance company, on your pay slip, on your OASI card or on the personal ID card of your pension fund. Related articles Can I open several vested benefits accounts at once? Why should I open a vested benefits account? Which IDs can I use to register for ePlix ? Are there additional costs for theme funds? Account and securities savings in pension : What is the difference?