Enrolling Family Members

To enroll family member(s) for coverage you must first access the enrollment website and enroll the family member(s). You then must provide additional documentation to support your relationship to that person. For example if you are adding your spouse you must provide a copy of the state certified marriage certificate.

We also require additional declarations of eligibility for Domestic Partners and children for whom you serve as Legal Guardian. These required forms will be mailed to you when you make this election on the enrollment website. Click here to view a complete list of eligible family members and the documents we require. Click here to access all of the declaration forms or visit your location’s Payroll Clerk.

Coverage for your eligible family members will not take effect until you have submitted all of the required certificates, declarations and documentation. You may submit your certificates and additional forms in any of the following ways:


  • Log into the Enrollment Website
  • From the home page, go to My Alerts to navigate to the "Dependent Approval" page
  • Follow the instructions to upload electronic documents for each eligible dependent

By Mail

Costco Wholesale 
Attn: Dependent Documents
PO Box 5838
Hopkins, MN 55343

By Fax

Attn: Enrollment Center