- Birth certificates of any children in the marriage
- Chils adoption documentation if any
- Joint tax return transcripts from IRS
- Joint lease or mortgage
- Loaned in both names
- Joint credit card statements
- Statements from joint checking, savings, brokerage accounts
- Utility bills for gas, water, electrical etc showing both names
- Car title in both names, car insurance in both names
- Home insurance, renters insurance, medical insurance in both names
- Copies of airline boarding passes / reservations in both bames
- Membership for things like Costco, National Park cards etc in both names
- Copies of Driver Licences or State IDs showing matching address
- Wills mentioning the spouse
- 401k plans listing the spouse as a beneficiary
- Family plans for Amazon, Netflix, cellular showing both names
- Affidavits from friends, family, landlords showing they know you as a married couple for a while
- Copies of receipts for gifts to each other for anniversaries, New Year etc
- USPS Informed Delivery emails showing letters to both. Any copies of letters addressed to both of you
- Photos of both of you with family, friends, colleagues. They should be titled, dated and annotated (location, event, who is on photo etc). Should include photos from different periods of time through your marriage
- Screenshots of you listing your spouse as emergency contact at work and other places and other way round
- Many more stuff you can think of...
All the evidence should be complete, e.g submit full documents and not just first page. Evidence should cover period from start of marriage to date of filing.