Cook County offers a Section 457 deferred compensation plan as a tax-deferred method for you to save for retirement. On the paper form, you will need to fill out your personal information.Beneficiary Information. If you would like to confirm or update your beneficiary information, please visit our website at CookCountyDC. You will need your Social Security Number and PIN to enroll in the Plan online. Please schedule a local office in-person appointment or call us at 1-855-457-2665. Enrolled in a retirement plan but don't have an online account? Assistance from a local Nationwide Retirement Specialist is strongly recommended when completing this section. Please call 855-457-2665 for assistance.