Once you haven't touched your account for 3 to 5 years, banks usually transfer your money to the state of your last known address. Visit unclaimed.org and follow links to the website of each state where you have lived. You can also recover money in a deceased relative's account if you have proper documentation.
Life Insurance Policies
If it is not listed on unclaimed.org, use the Life Insurance Policy Locator at naic.org, a service run by state insurance regulators.
Retirement and Pension Accounts
Visit freeERISA.com to find your old employer's latest form 5500, which has contact information for the administrator. If your 401(k) was terminated, check askebsa.dol.gov/abandonedplansearch for contact information. If your pension plan failed or was shut down, you may still qualify for a payment from the Pension Benefit Guaranty Corp, look for your plan at pbgc.gov/search-unclaimed-pensions. If all this is fruitless, the nonprofit Pension Rights Center (pensionrights.org) may be able to help.