full list here.

• visiting spouse in a hospital during restricted hours or in icu
• ability to make financial/medical decisions on spouse’s behalf if they cannot
• immigration and residency benefits
• inheriting spouse’s estate
• exemption from taxes on property you give/leave to your spouse
• social security, medicare, disability benefits for spouse
• veteran and military benefits extend to spouse
• insurance benefits extend to spouse
• ability to take family leave to care for ill spouse
• receiving wages/compensation/benefits for deceased spouse
• filing for joint adoption
• applying for joint foster care rights
• child support, child custody, visitation in case of divorce
• ability to live in “families only” neighborhoods
• receiving family rates for insurance
• tuition discounts
• court cannot force you to disclose confidential conversations between you and spouse
• receiving crime victim recovery benefits if spouse is the victim of a crime
• visiting rights if spouse is in jail